Because sleeves shouldn’t slow you down. This piece is cut for motion and made for heat — soft where you need comfort, strong where you need staying power.

From the couch to the concrete to the class, it carries the ATSY creed: you can’t break what’s been fire-forged.

This isn’t just a tank.

This is ATSY.

Crafted from 100% airlume combed ring-spun cotton, the ATSY Muscle Shirt delivers a smooth handfeel with a light 4.2 oz/yd² (142 g/m²) fabric that breathes under pressure.

A relaxed fit with wide, low-cut armholes creates unrestrained mobility, while side-seamed construction keeps the drape clean and the silhouette sharp.

Features:
• 100% airlume combed ring-spun cotton
• Fabric weight: 4.2 oz/yd² (142 g/m²)
• 32 singles (finer, softer weave)
• Relaxed fit
• Side-seamed construction
• Wide, low-cut armholes
• Blank product sourced from Nicaragua, Honduras, or the US

• S: Shirt Width 45.7 cm | Shirt Length 66 cm | Chest to fit 86.4–94 cm
• M: Shirt Width 50.8 cm | Shirt Length 68.6 cm | Chest to fit 96.5–104.1 cm
• L: Shirt Width 53.3 cm | Shirt Length 71.1 cm | Chest to fit 106.7–114.3 cm
• XL: Shirt Width 58.4 cm | Shirt Length 73.7 cm | Chest to fit 116.8–124.5 cm
• 2XL: Shirt Width 63.5 cm | Shirt Length — | Chest to fit — 127 – 134.6 cm