Signed USWE Sports, the 500 ml Ultraflask with straw and Phaser Bite valve is a flexible water bottle designed for hydration during sports activities, made of ultra-durable and abrasion-resistant TPU, with radio-frequency welded seams for superior durability and elasticity compared to traditional soft water bottles. It can be frozen to keep water cool longer during the summer, or filled with hot water up to 60°C, for versatile use in all seasons. Completely BPA and PVC free, for safe and reliable hydration every time you use it.