This water bottle holder is made of 100% silicone with a polyester detachable strap. 1) Compatible with 40oz tumbers with lids and handles 2) Silicone protects the water bottle and is washable, dirt resistant and reduces friction/noise 3) Cut-out in front allows for easy placement of a cellphone and the silicone material keeps it snugly in place 4) Cut out allows for cup logo/design features to be visible 5) Detachable crossbody strap allows for hands free carrying 6) Hole/vent in the bottom of the case allows for drainage