(260gsm) medium-weight premium french terry 65% cotton for comfort and breathability 35% polyester for durability and wrinkle prevention 1x2 ribbing at cuffs/waistband for maximum recovery Lightweight backpack lining makes straps undetectable in hoodie form Reinforced cover stitching throughout The patented hoodie transforms into a fully-functional backpack in a matter of seconds! The end result is a super sleek, body-conforming backpack with two built-in storage compartments, one for larger items, and one for smaller items like your cell phone, wallet or keys. The backpack straps are fully adjustable using our patent pending Slide&Bite™️ cord locks and can be tightened for comfort and security during high-intensity activity.