Lightweight thermal efficiency. Engineered for high performance with reduced weight, the Sierra Thermal Jacket is the essential layering solution for any outdoor adventure. Featuring Stormtech Thermal Shell&trade insulation and a DWR water-repellent finish to keep you warm and dry in while mild wet weather. The full-length internal stormflap adds extra protection against the elements, while the quilted design ensures optimal heat retention without the bulk. Built with feather-free insulation, this jacket provides sustainable warmth, and the elasticized cuffs help lock in heat, ensuring you're ready for anything, no matter the weather.