The ultimate tree climbing T-shirt made from a unique breathable, climate control fabric. Stretch-Air patented climate-control 'Distance Fibers' use Cocona, a special fiber made from coconut husks - yes, coconut husks. Cocona transports all moisture away from the skin and is comfortable and soft on the skin. Cocona is organic and eco-friendly. The elastic quality of Stretch-Air fabrics make them ideal for tree climbing- great fit with complete freedom of movement. This shirt was specifically designed for tree climbing. High collar and zip neck prevents debris from entering via the neck opening. Professional gear for professional arborists.