The Penfield Men's Rockwool Down Vest incorporates the best of stylish details and functional warmth for chilly transitional seasons and colder winter months. Leather along the shoulder yokes adds rich detail, while the super soft shearling collar provides luxurious comfort. Its toasty 550 fill down insulation traps precious body heat from escaping when the mercury dips below freezing. Striking an ideal balance between rugged durability and comfort, Penfield's signature 6040 shell is ideal for outdoor pursuits with its tightly woven windproof fabric. This outer shell is treated with a Durable Water Repellent and Teflon coating to repel outside moisture from seeping through and compromising the down's heat trapping loft. Additionally, its tightly woven construction makes it completely down proof, meaning that down clusters won't escape or migrate after casual wear and washing.