Sealskinz Waterproof Hydrostop All Weather Mid Length Sock Size:L With a lightweight breathable back

With a lightweight breathable back system and removable waist belt

collapsible

3 pack of replacement nozzles for your Osprey Hydraulics® Reservoir Bite Valve

Easy to fix on the outside of the rucksack for emergency use and back protection

but doesn't hold onto the sweat and smells like other fabrics

Sealskinz Waterproof Hydrostop All Weather Mid Length Sock Size:L With a lightweight breathable backThe original, military trusted sock, enforced with Hydrostop. A mens and womens waterproof sock, the Briston thrives in multiple environments. Hydrostop prevents water dripping down leg into sock. Lightweight and breathable. Handcrafted in the Sealskinz factory in Norfolk. *In very rare cases, close bond between sock cuff and skin may lead to rubbing.