Description

Designed to keep you hydrated on the move, the Nathan insulated soft flask provides big-time insulation for big-time thirst, keeping your H2O cool for mile after mile.

Features

• 18 fl. oz. BPA-free soft flask with locking cap and bite-valve design keeps liquids from escaping while you run
• Support spine creates a superior hand feel and support for the flask as the water level decreases in the bottle
• Insulated design keeps fluids cooler 38% longer than non-insulated soft flasks
• Compatible with all Nathan hydration vests (not included)