Rab's Kinetic Alpine 2. 0 Waterproof Jacket is an all-in-one shell for alpine excursions. With hardshell waterproofing and softshell stretch, this versatile shell jacket keeps us ready for any conditions the high elevation may throw our way. Unlike traditional climbing shells, the Proflex 3-layer construction features stretchy, durable synthetics that offer the range of motion we need without limiting abrasion resistance, especially in high-wear zones like the lower arm, cuff, shoulder, and hip.