2025-2026 Arsenal Training Jersey (Aurora Ivy) - Kids (Martinelli 11)
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.
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.
| 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 |
| 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 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.
| 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" |
| 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" |
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.
| 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" |
| 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.
| 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.
| 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) |
| 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 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 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.
| 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 |
| 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?
I am between two sizes — which should I choose?
Do jerseys shrink after washing?
Can I wear an NFL or NHL jersey over a hoodie?
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.
-
Free Shipping Over $57
-
30-Day Easy Returns
-
Pre-Dispatch Size Check
-
SSL Encrypted Checkout