WATERPROOF: Salt-resistant leather, and KEEN.DRY waterproof, breathable membrane keeps your feet dry in wet terrains; The Circadia boot has a mesh liner that integrates with the waterproof membrane FIT MATTERS: Our iconic KEEN Original Fit gives generous space for toes to spread out; Contoured heel lock for a more secure fit TRACTION: Grippy rubber helps give you the traction you need on varied trail terrain COMFORT: KEEN LuftCore technology embeds a light, air-injected core into high-density foam for comfort that lasts all day; Notch in the back of the collar for Achilles comfort CLOSURE: Speed hooks allow for easy lace adjustment and improves your ability to easily get the footwear on/off