Gear Review: Nikwax Down Proof

Boost the performance of your down gear

Love down, but live in a rainy climate? Treat bags and puffies with Nikwax Down Proof, a wash-in waterproofing treatment that keeps the feathers from absorbing moisture. It worked wonders for our Maine tester in the humid Mahoosuc Mountains, keeping his insulation dry, and thus still warm and light. $12; 10 oz.;