The Men's UA Base 4.0 Leggings were built to battle nature's coldest and most brutal conditions. Their patented negative grid fabric traps heat in tiny pockets to keep you ridiculously warm without feeling weighed down. They wick away excess moisture in their unique grid channels—keeping you dry and comfortable no matter how hard you work. You can also move with unrestricted ease thanks to UA's super-stretchy fabrication. Facing insane temperatures? Get the performance leggings that make more sense—and deliver more warmth—than anything else out there.