Built with AlpacaTek Technology for ultimate thermoregulating capabilities so you can focus on the trails ahead. Designed with two insulated body panels, and a maxi-stretch side panel for comfort and increased range of motion. Our running vest features extra insulation in the hood and side pockets for added protection against the elements. Made with our Dry Fusion Technology that increases breathability, wicks away moisture at an 85% higher rate than merino wool, and offers antimicrobial properties for odor resistance, to ensure you stay warm and dry throughout every wear.