Mountain Warehouse Borealis Womens Down Jacket Fabric Composition- 75% down and 25% feather Waterproof- Taped seams make this jacket fully waterproof. Rated at 5000mm Down Proof Lining - Prevents the feathers escaping Breathable - Our IsoDry fabric allows air to circulate, makes sure you stay dry on the inside and lets moisture out. Rated at 5000g Hood- Detachable hood with elastic cord for better, secure fit and faux fur trim for extra warmth