When you ride in frigid conditions your options for lightweight insulation under your outerwear are limited. Its typically been an fleece jersey with rear pockets that only adds to bulk & weight. Insulation with a high warmth to weight ratio like down feathers or polyester fiber-fill are ideal but those materials need to be encapsualted with a coated fabric to contain them cutting breathability down significantly. Our solution is Polartec Alpha insulation that provides insulation without the need to encapsulate giving you unimpeded breathability for a warm dry ride. The outer shell is lightweight & uncoated furthering the flow of perspiration & allowing the piece to packable when you need to de-layer when things get too hot. The jacket is designed to be worn under an outer jacket such as our Deflect H2O pieces so the fit is close to the body to eliminate any bulk. An under-the-helmet hood provides an added wind layer & traps heat in were you lose it at the top of your head & we finish off the neck & wrists with reflective binding for visiability in case youre caught out after sundown. Woven Pertex Quantum Air outer-shell is combined with 90g Polartec Alpha breathable insulation to create the ultimate packable breathable & warming insulation piece. Non-insulated hood is intended to be used under the helmet to keep the wind at bay & to trap heat on cold rides. Two front hand pockets keep your hands warm off the bike & provide room for your small essentials & electronics. Edge binding at the wrists & collar seal in warmth & feature reflecitve tape woven-in for increased visibility to motorists in low-light conditions. Deflect™ UV 50+ protects against harmful UV rays. Fit is close to the body for layering under outerwear. For a looser street fit we recommend one size up. Shell fabric weight: 48g