Warm lining with all-way stretch Rib-knit construction Roll up cuff Advanced insulating yarn The Heat Holders® Women's LITE™ Olivia Rib Knit Roll Up Hat is made with a super soft, warm lining that features all-way stretch to ensure a comfortable fit and everyday warmth in the moderate temperatures of transitional seasons. The Heat Holders® Olivia hats are sewn to better fit the contours of your head, maximizing insulation, and the roll up style adds a layer of warmth where your ears need it the most - with moisture and odor management to keep you drier and fresher.