Tanks/Muscles/Tees
Chest: inches / cm
Small: 34-37 / 86-94
Medium: 38-40 / 96-102
Large: 41-43 / 104-110
X-Large: 44-46 / 112-116

Athletic Shorts/Jams/Pants 

Waist: inches / cm
Small: 28-30 / 71-76
Medium: 31-32 / 78-84
Large: 33-34 / 86-92
X-Large: 35-36 / 94-96

Underwear/Swimwear
Waist: inches / cm
Small: 28-30 / 71-76
Medium: 31-32 / 78-84
Large: 33-34 / 86-92
X-Large: 35-36 / 94-96