Under Armour Base 4.0 ColdGear Long Sleeve Size:S Its lightweight construction

Its lightweight construction

blended interwoven fiberglass fibers made to FMF's specifications for high heat resistance

Outer Material: Aramid fibres lining in knees and seat made with Kevlarby progressive DuPont technology

Inner pocket within thermal liner

Outer shell material: CORDURA 500D

Under Armour Base 4.0 ColdGear Long Sleeve Size:S Its lightweight constructionUA Base is a system of baselayers, numbered from 2. 0 4. 0, that takes you from cold to absolutely freezing temps. It uses a special negative grid structure to trap heat without adding bulk. Think long underwear, re engineered for athletes performing at their peak. UA Base 4. 0 is built for extreme cold weather and lower activity levels. FEATURES Fitted: Next to skin without the squeeze. UA Base 4. 0 Extreme Baselayer is the warmest yet, locking in