ULTRASPIRE 550 POCKET HANDHELD WATER BOTTLE PRODUCT DETAILS The 550 Pocket Handheld is built from UltrAcool Light Mesh which provides comfort, durability, and breathability. Soft perimeter binding eliminates any abrasion on the hands while running. This handheld utilizes a non-slip securing strap which stays out of the way on the backside of the hand. The 4-way stretch mesh pocket is 80% nylon and 20% spandex for capacity and durability. The zippered compartment is designed with no seams allowing the pocket to stretch outward to carry more items and keep those items from moving around.