These endura bibshorts use a thermolite material which makes them ideal for cold weather cycling thermolite uses a hollow core fibre technology to create an insulating layer of warm air the fabric is lightweight and warm with superior moisture vapour transport properties which don39t get heavy even when they get wet the thermolite quality developed by endura has the added benefit of a high performance repel teflon fabric protector finish this gives you ultimate weather control with durabl