Heat Holders® ULTRA LITE™ Base Layers will keep you warm on those cold winter days. Choosing the perfect Heat Holders base layer - Consider both activity levels and temperature to determine which Heat Holders® base layer is right for you.A light weight Heat Holders® base layer can be best in extreme cold if activity levels are high.Likewise a heavier weight base layer can be best in milder temperatures if your activity levels are low.
ULTRA LITE™: Light weight warmth ideal for everyday cold.
LITE™: Medium weight warmth ideal for very cold days.
ORIGINAL™: Heavy weight warmth ideal for extreme cold.