Get kitted out for cold weather and winter running with a pick from our wide collection of mens running base layers, designed to give you a lightweight and flexible extra layer. The biggest names in sportswear feature here, including <a href="/under-armour/under-armour-running">Under Armour</a>, <a href="/nike/nike-running/all-mens-nike-running">Nike</a> and <a href="/adidas/adidas-running">adidas</a>, with base layer tops, shorts, tights and underwear, all of which will fit neatly under your other running gear. Don't let the cold prevent you from reaching your goals.