They will slow the movement of heat into or out of your water bottle, preserving your hot chocolate in the winter and ice water in the summer. Urethane foam insulation is lightweight, has low conductivity, and high thermal resistance, insulating better than any fiber insulation. Zipper closure provides quick access to your bottle, provides an efficient thermal seal, and eliminates the possibility of your bottle falling out.
Coating protects the foam insulation from water and dirt.
The antron nylon face fabric reflects sunlight to aid insulation in keeping drinks cool. Available in multiple colors.