When the mercury drops, the Patagonia Capilene Thermal Weight Men's Boot Length Bottoms bring serious warmth without the weight. These grid-fleece long johns trap heat in their raised pattern while still breathing, and the boot-length cut tucks cleanly into ski boots without bunching.

Why we like it:

The grid construction is the difference maker, forming little air pockets that hold warmth alongside channels that move sweat and shed excess heat.

Features and Functions:

A 4.5 ounce Polartec Power Grid fabric does the work here, 92 percent recycled polyester with 8 percent spandex, a grid-back fleece that balances warmth, stretch and breathability while carrying HeiQ Mint odor control for long stretches between washes. The narrowed ankle keeps fabric from balling up inside a boot, a soft encased waistband stays comfortable under a bib, and the bottoms are Fair Trade Certified.

Fit and Sizing:

Cut close for layering with a bit of stretch, and sizing runs true. The tapered lower leg is designed to sit under a boot liner.

Bottom Line:

These are the pick for cold resort days, chairlift-heavy outings and deep-winter tours where you need real insulation next to the skin. Best for skiers who tend to run cold.