For riders who refuse to hang up the bike when winter hits, the Summit AmFIB® Alpha Pant is built to go deep into the coldest months with purpose-driven performance. Our warmest mountain bike pant uses strategically mapped Polartec® Alpha® Direct insulation across the seat and thighs to deliver breathable warmth where it matters most—keeping you dry and thermally balanced during high-intensity efforts. AmFIB® softshell fabric wraps the legs in windproof, water-resistant protection , while a PFAS-free PI Dry® finish ensures eco-conscious moisture management in variable conditions. Zippered Trail Access pockets secure essentials without disrupting your pedal stroke, and tapered cuffs with zip openings offer versatile fit over a range of footwear. Designed to layer comfortably over your go-to liner shorts or thermal cycling bibs , this pant unlocks cold-season trail potential with every turn of the cranks. Part of our Ride 365 philosophy, it’s made for those who see winter not as a break—but as a challenge to keep going.