"What Our Gearhead® Experts Are Saying: ""After a full season in the Reserve 3L Pants, I’m convinced they’re one of the best shells out there. The 20k waterproofing and thigh vents handle everything from blower powder days to warm park laps, and the drop seat feature is a game changer. They’re light, breathable, and built to last through years of abuse."" We chase storms, bluebird days, and everything in between — and the Burton Reserve 3L Pant keeps up with all of it. Crafted from recycled polyester with Burton’s DRYRIDE 3-layer membrane, this bib-style shell delivers 20k/20k waterproof and breathable protection that keeps us dry without sacrificing airflow. Whether we're waist-deep in powder or cruising spring slush, the 3-layer construction gives us freedom to layer up or down for comfort in any condition. Every detail on these pants is rider-focused: from the fully taped seams and YKK® water-resistant zippers to the stretch back panel and elastic jogger-style cuffs that fit easily over boots. The mesh-lined thigh vents let us dump heat on climbs, while multiple pockets — including a media-compatible chest pocket and drop seat construction — keep essentials secure and functional. Bluesign® approved and PFC-free, the Reserve 3L brings technical performance with a lighter environmental footprint."