Vacuum Stainless Steel Bottle brand_Petzl easy to clean and foldable a sternum strap with easy to clean and foldable breathable WR TEX membrane seals out wet conditions and lets feet breatheEnhanced Foot ComfortSensor3 inserts reduce pressure points for a relaxed fit and improved circulation in the feetAll Terrain GripA lugged outsole provides confident all terrain gripComfortable DropDesigned with 8mm of drop between heel and toe for a balance of performance and comfort for running and walkingOptimum SupportWrapping Band upper design supports foot while ensuring breathability thanks to perforated areasWater Repellent FinishDurable Water Repellent (DWR) coating resists wet conditionsSPECIFICATIONSVamp Materials: TPU film textile Vamp Waterproofness: Yes Liner Materials: Texitle Liner Thermal insulation: None Closings Lacings: Oval lace 6mm POLYESTER Soles Materials: Injected EVA Rubber Other features: Textile PU travel bags The bottle also includes a BPA free plastic rim and lining