Better than a warm cup of coffee on a brisk fall morning " take the chill off by layering on thelightweight insulated Fall Run Vest. Worn alone or paired with a waterproof, breathable shell, the Primaloft insulation is treated for water repellency to keep you warm even when damp from rain or heavy activity. Extremely compressible, it's the ideal layer for stowing in your daypack or sling pack.