Made of soft, medium-weight, (225-grams) Alpine Hemp stretch jersey, environmentally-friendly 100% organic cotton and recycled polyester for enhanced 4-way stretch. This t-shirt was designed as a result of comprehensive research and feedback from climbers, professional athletes and mountain guides. At the chest and shoulders, weve added a Durastretch overlay for additional technical durability. Hemp provides soft, natural comfort and high functional performance with a low environmental impact.