To retain warmth in the icy evening air, both covered themselves in their ponchos.

In particularly cold conditions, long-sleeved shirts and tights can be worn to retain warmth without losing mobility.

I kept my jacket hood over my head to retain warmth.

Beyond that, synthetic materials dry easily and retain warmth even when soaked.

The rooftop is ridged to provide shade in the summer while retaining warmth in the winter.

These baths are light in weight, so can be carried into the bathroom easily, and retain warmth as well.

But many people swim all winter, especially in the sea, which retains warmth from the summer sun.

These dwellings remain cool in summer and retain warmth in winter.

Fertilized duck eggs are kept warm in the sun and stored in baskets to retain warmth.

They are lined with Thinsulate, a light fabric that retains warmth.