The Unify adults base layer top has been crafted using a cotton rich material, giving it a super soft feel you`ll love to wear. The construction ensures insulated warmth, while reinforced seams give superior durability at the joints. This base layer is ideal for colder climates and seasons. Material: 60% Cotton, 40% Polyester. Trespass Mens Chest Sizing (approx): S - 35-37in/89-94cm, M - 38-40in/96.5-101.5cm, L - 41-43in/104-109cm, XL - 44-46in/111.5-117cm, XXL - 46-48in/117-122cm, 3XL - 48-50in/122-127cm. Ref: UTTP3854