Baselayer Thermal Underwear

Baselayer thermal underwear is a lightweight insulating layer that you wear next to the skin. These baselayers need to be worn snugly so that no hot air is wafted out during activity, and if a hydrophilic treatment is present in the fabric, to allow the effective transportation of perspiration. Being lightweight they are ideal to be worn in Spring and Autumn, and form the first layer of thermal insulation during cold winter months.