Designed for serious winter adventuring, the Saxx GridFlex Midweight Base Layer Bottoms are your go-to choice for skiing, snowboarding, or any cold-weather pursuit. Built from recycled double-knit fabric with 4-way stretch, they deliver breathable warmth and next-to-skin comfort.
- Three-D Fit™ 9-panel construction enhances mobility on the slopes
- BallPark Pouch™ provides friction-free support where it counts
- Flat Out Seams™ reduce chafing by placing softer seams inward
- Raised grid back boosts airflow while managing moisture buildup
- Inner leg gusset improves flexibility and fit for active use
Whether you’re carving down fresh powder or hiking through snowy trails, these men’s thermal underwear for cold weather adapt to your every move. They’re a smart pick when you buy men’s activewear base layer online and want gear that keeps you warm without overheating.
Michael Quinn (verified owner) –
These base layer bottoms kept me warm on my ski trip in Colorado — no bulk, just comfort and mobility.
Judith Shea (verified owner) –
Love the moisture wicking performance. I wore them snowboarding and they stayed dry even after hours on the mountain.
Christopher Cooper (verified owner) –
Hands down the best thermal underwear I’ve owned. The fit is incredible and they don’t ride up or pinch anywhere.