The Adidas TechFit Apparel Range has been designed to give athletes a distinct psychological and phsiological advantage on the field of play. Techfit products positively influence an athlete's body posture and explosivity during sporting activities, resulting in an improved athletic performance. Climacool fabric creates an adaptive layer, which balances temperature by both insulating during cold weather and keeping you cool and dry in hot weather by wicking sweat away from the skin. Size Guide: SMALL: 89-94cm chest/ 76-81cm waist MEDIUM: 97-102cm chest/ 81-86cm waist LARGE: 104-109cm chest/ 86-91cm waist X LARGE: 112-117cm chest/ 1-97cm waist