The Nike ACG Therma-FIT Wolf Grid Pant solves a real hiking problem: gear that traps sweat until the cold turns a good day into a turn-back decision. A checkerboard-patterned fleece does two jobs at once, raised squares hold body heat close while low squares open thin channels that carry sweat away before it chills us down. Nike Therma-FIT technology manages that heat further, so the pant stays warm without the bulk of a heavier fleece. What Our Gearhead(R) Experts Are Saying:"I pushed through a steep, sweaty climb in these expecting to feel that familiar cold, clammy chill at the top, and it never came. The low squares pulled the moisture through fast enough that I stayed warm instead of turning back."