21 oz Lightweight Wide Mouth Bottle with Flex Cap Size:One Size They're made of breathable spandex

They're made of breathable spandex with TPR knuckle protection and neoprene cuffs

Moisture-wicking fabric along with nylon overlays

16/90 40/80

Side slits at hem for ventilation

Necessary if you plan on using the sail kit

21 oz Lightweight Wide Mouth Bottle with Flex Cap Size:One Size They're made of breathable spandexDurable, yet 25% lighter than our other 21 oz bottles, this lightweight stainless steel insulated water bottle is made for hiking and backpacking. The opening is ideal for quick sips, and the streamlined designs fits easily in your pack. ______________________ Lightweight hydration to keep you going 25 percent lighter than our other 21 oz Standard Mouth bottles TempShield double wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12