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2025-2026 Chelsea Strike Training Shirt (Green) - Kids (Nkunku 18)

$37.80 USD

$62.90 USD

Shipping fees will be calculated at checkout.

Size Guide

Jersey Pro Center Size Guide

The right size, the first time. All charts below use international standard body measurements — in inches and centimeters — covering jerseys, shorts, jackets, hoodies and pants across NFL, NBA, MLB, NHL and Soccer.

Quick Jump: 1. How to Measure 2. Fit by League 3. Quick Size Finder 4. NFL Football 5. NBA Basketball 6. MLB Baseball 7. NHL Hockey 8. Soccer Jerseys 9. Youth & Toddler 10. Shorts 11. Jackets & Hoodies 12. Pants & Joggers 13. International Conversions 14. Sizing FAQ

1. How to Measure

Take these measurements over a thin t-shirt (never outerwear), standing relaxed. Use a soft measuring tape.

1. Chest (Most Important)

Measure around the fullest part of your chest, directly under the armpits. Keep the tape parallel to the floor and don't puff your chest out.

2. Waist

Measure around your natural waistline — the narrowest part of your torso, usually just above the belly button. Key for shorts & pants.

3. Hips

Stand with feet together and measure around the fullest part of your hips and glutes. Crucial for track pants and athletic shorts.

4. Body Length

Measure from the highest point of your shoulder (next to the collar) straight down to where you want the hem to sit.

5. Sleeve Length

For long-sleeve jerseys and jackets: measure from the shoulder seam down to your wrist with your arm slightly bent.

6. Inseam (Pants)

Measure from your crotch straight down to your ankle bone along the inside of your leg to find your ideal pant length.

2. Fit by League (Overview)

Each major sports league designs jerseys with a distinct traditional silhouette.

League	Cut Style	How It Should Feel & Fit Advice
Soccer	Athletic / Slim	Close to the body. If you are between sizes or prefer a streetwear look over t-shirts, size up.
NBA Basketball	Standard / Long	Relaxed through chest and shoulders with an elongated hem. True to size; size up if layering over hoodies.
NFL Football	Roomy / Boxy	Classic oversized game-day cut with broad shoulders. Plenty of room for hoodies. Order true size or size down for tailored fit.
MLB Baseball	Full / Button-Front	Relaxed traditional baseball cut with extra room in chest. True to size; fits comfortably over casual layers.
NHL Hockey	Very Loose / Generous	The loosest cut of all leagues. Wide through body with extra-long sleeves. Never size up; order true size.

3. Quick Size Finder by Chest Measurement

Locate your chest measurement to see your recommended size across all five sports leagues at a glance.

Chest (Inches)	Chest (cm)	Soccer	NBA	NFL	MLB	NHL
34–37"	86–94 cm	S	S	S	S	S
38–41"	97–104 cm	M	M	M	M	M
42–45"	107–114 cm	L	L	L	L	L
46–49"	117–124 cm	XL	XL	XL	XL	XL
50–53"	127–135 cm	2XL	2XL	2XL	2XL	2XL
54–57"	137–145 cm	3XL	3XL	3XL	3XL	3XL
58"+	147+ cm	4XL	4XL	4XL / 5XL	4XL / 5XL	4XL / 5XL

4. NFL Football Jerseys

Roomy, boxy supporter replica cut. Built for game-day comfort and layering over hoodies.

Men's NFL Jerseys

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)
S	35–37.5"	89–95 cm	29–32"	30.0"	76 cm
M	37.5–41"	95–104 cm	32–35"	31.0"	79 cm
L	41–44"	104–112 cm	35–38"	32.0"	81 cm
XL	44–48.5"	112–123 cm	38–43"	33.0"	84 cm
2XL	48.5–53.5"	123–136 cm	43–47.5"	34.0"	86 cm
3XL	53.5–58"	136–147 cm	47.5–52"	35.0"	89 cm
4XL	58–63"	147–160 cm	52–57"	36.0"	91 cm

Women's NFL Jerseys (Contoured Cut)

Size	Bust / Chest (in)	Bust / Chest (cm)	Waist (in)	Length (in)	US Numeric Size
S	33–35"	84–89 cm	26–28"	27.0"	4–6
M	35–38"	89–97 cm	28–31"	27.5"	8–10
L	38–41"	97–104 cm	31–34"	28.0"	12–14
XL	41–44.5"	104–113 cm	34–38"	28.5"	16–18
2XL	44.5–48.5"	113–123 cm	38–42"	29.0"	20–22

Youth NFL Jerseys

Youth Size	Age Range	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Height (in)
Youth S (8)	7–8 Yrs	26–28"	66–71 cm	23.0"	58 cm	50–54"
Youth M (10-12)	9–11 Yrs	28–30"	71–76 cm	25.0"	64 cm	55–59"
Youth L (14-16)	12–13 Yrs	31–33"	79–84 cm	27.0"	69 cm	60–63"
Youth XL (18-20)	14–16 Yrs	34–36"	86–91 cm	29.0"	74 cm	64–67"

5. NBA Basketball Jerseys

Sleeveless standard athletic cut with extended length. Measurements for men, women, and youth notes.

Men's NBA Swingman Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Shoulder Width (in)
S	37–39"	94–99 cm	28.5"	72 cm	17.0"
M	39–41"	99–104 cm	29.5"	75 cm	18.0"
L	41–43"	104–109 cm	30.5"	77 cm	19.0"
XL	43–46"	109–117 cm	31.5"	80 cm	20.0"
2XL	48–52"	122–132 cm	32.0"	81 cm	21.5"
3XL	52–56"	132–142 cm	33.0"	84 cm	22.5"

Women's NBA Jerseys

Size	Bust (in)	Bust (cm)	Waist (in)	Length (in)
S	32–34"	81–86 cm	25–27"	25.5"
M	34–36"	86–91 cm	27–29"	26.5"
L	36–39"	91–99 cm	29–32"	27.5"
XL	39–42"	99–107 cm	32–35"	28.5"

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Youth NBA Jerseys

Youth NBA jerseys follow the same sizing as the general youth chart in Section 9 (S / M / L / XL by age and height).

6. MLB Baseball Jerseys

Traditional full button-front styling. Relaxed profile through chest and shoulders.

Men's MLB Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Sleeve (in)
S	35–37.5"	89–95 cm	30.0"	76 cm	18.5"
M	37.5–41"	95–104 cm	31.0"	79 cm	19.0"
L	41–44"	104–112 cm	32.0"	81 cm	19.5"
XL	44–48.5"	112–123 cm	33.0"	84 cm	20.0"
2XL	48.5–53.5"	123–136 cm	34.0"	86 cm	20.5"
3XL	53.5–58"	136–147 cm	35.0"	89 cm	21.0"

Women's MLB Jerseys

Size	Bust (in)	Bust (cm)	Waist (in)	Length (in)
S	33–35"	84–89 cm	26–28"	26.5"
M	35–37.5"	89–95 cm	28–30.5"	27.0"
L	37.5–40.5"	95–103 cm	30.5–33.5"	27.5"
XL	40.5–44"	103–112 cm	33.5–37"	28.0"

7. NHL Hockey Jerseys

The roomiest cut in all sports. Wide torso and oversized sleeves meant to replicate ice-ready sweaters.

Men's NHL Breakaway Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Sleeve (in)
S	40–42"	102–107 cm	31.0"	79 cm	25.0"
M	43–45"	109–114 cm	32.0"	81 cm	26.0"
L	46–48"	117–122 cm	33.0"	84 cm	27.0"
XL	49–51"	124–130 cm	33.5"	85 cm	27.5"
2XL	52–55"	132–140 cm	34.0"	86 cm	28.0"
3XL	55–58"	140–147 cm	35.0"	89 cm	29.0"

8. Football / Soccer Jerseys

Supporter replica fan fit. Athletic cut — size up for a looser streetwear fit or for layering.

Men's / Unisex Soccer Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Weight Recommendation
S	35–37"	89–94 cm	27.5"	70 cm	55–65 kg (120–143 lbs)
M	38–40"	97–102 cm	28.5"	72 cm	65–75 kg (143–165 lbs)
L	41–43"	104–109 cm	29.5"	75 cm	75–85 kg (165–187 lbs)
XL	44–46"	112–117 cm	30.5"	77 cm	85–95 kg (187–209 lbs)
2XL	47–49"	119–124 cm	31.5"	80 cm	95–105 kg (209–231 lbs)
3XL	50–52"	127–132 cm	32.5"	83 cm	105–115 kg (231–253 lbs)
4XL	53–55"	135–140 cm	33.5"	85 cm	115+ kg (253+ lbs)

Women's Soccer Jerseys (Tapered Waist)

Size	Bust / Chest (in)	Bust / Chest (cm)	Waist (in)	Length (in)	Length (cm)	US Dress Size
XS	30–32"	76–81 cm	24–25"	25.0"	64 cm	2–4
S	32–34"	81–86 cm	25–27"	25.5"	65 cm	4–6
M	34–36"	86–91 cm	27–29"	26.0"	66 cm	8–10
L	36–39"	91–99 cm	29–32"	27.0"	68 cm	12–14
XL	39–42"	99–107 cm	32–35"	27.5"	70 cm	16–18

9. Youth & Toddler Sizes

Unisex sizing consistent across all sports leagues. Sized by chest and height.

Youth Sizes (Ages 7–18)

Youth Size	Ages	Chest (in)	Chest (cm)	Height (in)	Height (cm)
Youth S (8)	7–8 Yrs	26–27"	66–69 cm	50–54"	127–137 cm
Youth M (10-12)	9–12 Yrs	28–30"	71–76 cm	55–60"	140–152 cm
Youth L (14-16)	13–15 Yrs	31–33"	79–84 cm	61–63"	155–160 cm
Youth XL (18-20)	16–18 Yrs	34–36"	86–91 cm	64–67"	163–170 cm

Toddler Sizes (Ages 2–6)

Toddler Size	Age Range	Chest (in)	Chest (cm)	Recommended Weight
2T	1–2 Yrs	20–21"	51–53 cm	24–28 lbs (11–13 kg)
3T	2–3 Yrs	21–22"	53–56 cm	28–32 lbs (13–15 kg)
4T	3–4 Yrs	22–23"	56–58 cm	32–36 lbs (15–16 kg)

10. Shorts (Soccer, Basketball & Training)

Elastic waist with interior/exterior drawstring closure. Sized by natural waist.

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam (in)
S	29–31"	74–79 cm	35–37"	89–94 cm	7.0"
M	32–34"	81–86 cm	38–40"	97–102 cm	7.5"
L	35–37"	89–94 cm	41–43"	104–109 cm	8.0"
XL	38–40"	97–102 cm	44–46"	112–117 cm	8.5"
2XL	41–44"	104–112 cm	47–49"	119–124 cm	9.0"

11. Jackets & Hoodies

Track jackets, windbreakers, varsity bombers, and fleece hoodies. Layer-friendly cut.

Size	Chest (in)	Chest (cm)	Body Length (in)	Body Length (cm)	Sleeve Length (in)
S	36–38"	91–97 cm	27.0"	69 cm	33.5"
M	39–41"	99–104 cm	28.0"	71 cm	34.5"
L	42–44"	107–112 cm	29.0"	74 cm	35.5"
XL	45–48"	114–122 cm	30.0"	76 cm	36.5"
2XL	49–52"	124–132 cm	31.0"	79 cm	37.5"
3XL	53–56"	135–142 cm	32.0"	81 cm	38.5"

12. Pants, Joggers & Track Pants

Drawstring waist with athletic taper. Check waist first, then inseam for height.

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam (in)	Inseam (cm)
S	29–31"	74–79 cm	36–38"	91–97 cm	30.0"	76 cm
M	32–34"	81–86 cm	39–41"	99–104 cm	30.5"	77 cm
L	35–37"	89–94 cm	42–44"	107–112 cm	31.0"	79 cm
XL	38–41"	97–104 cm	45–47"	114–119 cm	31.5"	80 cm
2XL	42–45"	107–114 cm	48–50"	122–127 cm	32.0"	81 cm

13. International Conversions

Shopping from outside North America? Convert your local regional sizing to our US standard sizing.

Men's Tops Conversion

US / Store Size	UK / AU	EU / Germany	France / Spain	Italy	Japan
S	36	46	46	46	M
M	38–40	48–50	48–50	48–50	L
L	42–44	52–54	52–54	52–54	XL / LL
XL	46–48	56–58	56–58	56–58	2XL / 3L
2XL	50–52	60–62	60–62	60–62	3XL / 4L
3XL	54–56	64–66	64–66	64–66	4XL / 5L

Women's Tops Conversion

US / Store Size	UK / AU	EU / Germany	France / Spain	Italy
XS	6	32	34	38
S	8–10	34–36	36–38	40–42
M	12–14	38–40	40–42	44–46
L	16–18	42–44	44–46	48–50
XL	20–22	46–48	48–50	52–54

14. Frequently Asked Questions About Sizing

What if I'm not sure which size to order?

Order the size you think fits best, then simply send us your height, chest, and waist measurements via email to jerseycare@outlook.com. Our specialists will check your dimensions before dispatch and ensure you receive the right fit.

I am between two sizes — which should I choose?

When in doubt, always size up. A slightly roomier jersey is comfortable, breathable, and easy to layer over t-shirts or hoodies. A jersey that is too tight rarely gets worn.

Do jerseys shrink after washing?

No. Our jerseys are made of premium recycled technical polyester mesh which is dimensionally stable and pre-shrunk. As long as you wash in cold water (30°C) and hang dry, shrinkage is less than 1%.

Can I wear an NFL or NHL jersey over a hoodie?

Yes! NFL and NHL jerseys are traditionally cut roomy and boxy specifically for this game-day look. Your normal t-shirt size will easily accommodate a standard hoodie. If you wear an extra-thick fleece hoodie, consider going up one size.

Jersey Pro Center Fit & Delivery Guarantee

All orders qualify for 30-day free returns and exchanges. Free worldwide tracked delivery applies to all orders over $57. If your jersey doesn't fit the way you like, our team will exchange it hassle-free.

Size

7-8 Years - 26-28" - 71cm 9/10 Years - 28-30" - 76cm 11/12 Years - 30-32" - 81cm 13/14 Years - 32-34" - 86cm 15/16 Years - 34-36" XS Boys - 5/6 Years

QUICK ANSWER

Supporter replica of the Chelsea training shirt used across the 2025-2026 Premier League campaign. Fan cut, recycled polyester, heat-applied detailing. Free shipping over $57, 30-day free returns, dispatch within 7-15 business days. A natural pick if Christopher Nkunku is the name you look for on the Chelsea team sheet.

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✓ 30-day free returns

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✓ Checked by hand before dispatch

✓ No hidden fees at checkout

✓ Colourfast fabric guaranteed

Chelsea Youth Training Shirt 2025-2026

This is the youth version of the Chelsea shirt — same look, gentler fabric, and a cut that allows room to grow.

One of us owns this in two sizes — one for matchdays, one that has given up pretending and lives on the sofa.

Why supporters pick this one

Crest sealed at the edges so it will not lift after washing
Ships worldwide with tracking on every order
Odour-resistant finish — better than cotton over a long day
Stretch knit moves in both directions without losing shape
Heat-applied crest and numbering that flex with the fabric

Specification	Product detail
Team & school	Chelsea (2025-2026)
Kit category	Training
Version / fit	Youth / cut for younger frames with room to grow
Fabrication	Ultra-soft lightweight breathable polyester
Embellishments	Smooth irritation-free heat transfer graphics
Fit & sizing	Youth S (8), M (10-12), L (14-16), XL (18-20)
Care standard	Machine wash warm, tumble dry low safe

Before you choose a size

The single most common reason for a return is expecting a player-issue fit. This is the fan cut: comfortable, forgiving, and designed to be worn for hours rather than ninety minutes.

It will not shrink meaningfully. The recycled polyester is pre-shrunk and dimensionally stable, so a cold wash and natural dry change the fit by less than one percent.

Name & number detail

Comes ready with {players} across the shoulders in official-style lettering — a flexible print that moves with the fabric instead of cracking.

Design accents: Kid-safe soft-touch print

How it fits and feels

Shoulders are cut generously without looking oversized, and the body has room to layer over a t-shirt.

Mesh panelling is positioned along the flank and under the arm where heat actually builds.

Appliqué work is done flat, without the puckering that shows up on cheaper reproductions.

Where you will wear it

Works for school spirit days, weekend training and watching the match with family — and it washes well between all three.

Care and washing

Wash inside out on a cool cycle and hang to dry. Heat is what kills heat-pressed lettering, not friction.

Shipping, sizing and returns

Free shipping on orders over $57 · Flat $7 shipping below $57 · Dispatched in 7-15 business days · 30-day free returns. Prices and the free-shipping threshold are converted to your local currency at checkout.

True to size with a relaxed fit. If you are between two sizes, go down for a closer fit or up if you plan to layer. Full measurements are on our size guide page.

Common questions

Can I actually play football in this, or is it just for wearing?

It works for casual play. Serious players tend to prefer tighter blocks, while cut for younger frames with room to grow here prioritises all-day comfort.

Should I order my usual size or size up?

True to Youth S (8), M (10-12), L (14-16), XL (18-20). Size up for layering, otherwise stay at your normal size.

Can it go in the tumble dryer?

Air dry instead. Direct high heat is precisely what lifts Smooth irritation-free heat transfer graphics over time.

From our team to yours

We do not claim to be an official club retailer. What we do claim is that the shirt you receive matches the photos, fits as described, and gets fixed if it does not.

Looking for other teams? Explore our full Premier League Jerseys collection.

Complete the kit: browse all Chelsea gear.

Questions about sizing or fit? Message us before ordering and we will sort it out.

Last updated: September 2026