There's few things worse than working up a sweat only to be drenched in sweat, especially in cold conditions. Whether you're running or breaking out the nordic skis, the lightweight Kor Stasis™ Jacket insulates against the cold while letting vapor pass through so pesky heat dissipates. A weather-resistant Pertex® Quantum Air outer means a little rain won't leave you high and not-so-dry, while PrimaLoft® Active insulation lends the stretch you need for high-octane tempos.