Our framed Collapsible Water Bottle is made mainly from Silicone with a quantity aluminum framework from the left and right sides, strong and durable.

Food grade PA66 plastic middle support, strong, heat-resistant, and drop-resistant with inner brass nuts on both sides.

A Silicone food-grade soft silicone material for the bottle body Stainless steel screw for the cap to make sure good tightnessSilicone lifting belt placed on one side of the bottle and closed to the middle support, very convenient for usesA compass on top of the cap, great helper for outdoor activities Stainless screws to make the left and right aluminum frames more strongly attached to the middle support.