Athletics Clothing Size Guide (UK Standard)

👕 T-Shirts (Technical / Running Tops)

 

Adult Sizes (Unisex Fit)

Size	Chest (inches)	Chest (cm)
XS	34–36	86–91
S	36–38	91–97
M	38–40	97–102
L	40–42	102–107
XL	42–44	107–112
XXL	44–46	112–117
3XL	46–48	117–122
4XL	48–50	122–127

Key Fit Notes:

• Athletic fit (slightly tapered)
• Lightweight, moisture-wicking polyester
• Ideal for both training and events

🏃 Running Vests / Singlets (Competition Wear)

 

Adult Sizes (Competition Fit)

Size	Chest (inches)	Chest (cm)
XS	32–34	81–86
S	34–36	86–91
M	36–38	91–97
L	38–40	97–102
XL	40–42	102–107
XXL	42–44	107–112

Key Fit Notes:

• More fitted than t-shirts (race cut)
• Larger arm openings for movement
• Ultra-lightweight, breathable mesh panels
• Designed specifically for competition

👉 Tip: Many runners size up if they prefer a looser fit.

🧥 Hoodies (Training / Leisure Wear)

Adult Sizes (Relaxed Fit)

Size	Chest (inches)	Chest (cm)
XS	34–36	86–91
S	36–38	91–97
M	38–40	97–102
L	40–42	102–107
XL	42–44	107–112
XXL	44–46	112–117
3XL	46–48	117–122
4XL	48–50	122–127
5XL	50–52	127–132

Key Fit Notes:

• Relaxed, slightly oversized fit
• Ideal for layering pre/post race
• Cotton/poly blend or performance fleece options

👶 Junior / Youth Sizes (Recommended Range)

Size	Age (approx)	Chest (cm)
5–6	5–6 yrs	60–65
7–8	7–8 yrs	65–70
9–11	9–11 yrs	70–78
12–13	12–13 yrs	78–86

👉 Essential for:

• Schools
• Junior athletics clubs
• Youth race events

🎯 Best Practice for Athletics Clubs & Events

To cover all participants, offer:

✔ Core Size Range

• Adults: XS to XXL (minimum)
• Ideal: XS to 3XL or 4XL

✔ Full Inclusive Range

• Include junior sizes
• Offer ladies-specific fits (optional but recommended)

✔ Garment Mix

• T-Shirts → Training & general use
• Vests/Singlets → Race day
• Hoodies → Warm-up, casual, merch

🧠 Pro Tips (From a Supplier Perspective)

• Always order size splits based on typical demand:
  • Most popular: M, L, XL
• Offer sample sizing if possible before bulk orders
• Consider dual fits:
  • Unisex + Women’s cut for better inclusivity
• Race vests should be slightly tighter than tees

🚀 Summary

For athletics clothing, a strong size offering ensures comfort, performance, and inclusivity:

• 👕 T-Shirts: XS–4XL (standard athletic fit)
• 🏃 Vests/Singlets: XS–XXL (race fit, lighter)
• 🧥 Hoodies: XS–5XL (relaxed fit)
• 👶 Juniors: Ages 5–13

Offering the right sizes alongside high-quality sublimated designs will boost club identity, improve performance comfort, and increase overall satisfaction.