The new Castelli Alpha Ultimate Insulated Jacket takes the brand's hugely well-reviewed Alpha RoS 2 cycling jacket and makes it 30% lighter, stretchier and even more comfortable to wear, while retaining the same levels of warmth, breathability and protection.This change has been brought about by altering the fabric makeup, so the jacket now has a highly flexible, waterproof yet breathable outer made from Polartec® NeoShell®, which remains separate from the equally airy Polartec® Alpha® insulation at the front of the jacket.So, if you want protection from the rain on a warm day, you can zip up the outer and leave the inner open; for a bit of insulation on a dry day, you can zip the inner and leave the outer open; when you're hot and sweaty after a climb you can vent both layers; or, when it's plain horrible out, you can zip them both up. Whatever winter conditions you're facing, including temperatures down to -5°C, this jacket can cope with them.Effectively waterproof seam taping at the shoulders, a flat lying hem that seals out the wind, and cuffs that integrate with your gloves to stop wind and water from entering all help to make this jacket warmer than its weight would suggest, while being impressively waterproof and letting sweat escape. Ample storage in the form of three rear pockets and a zipped side pocket rounds out a weatherproof jacket that's hard to beat in terms of versatility and comfort.Features:Fully windproof, effectively waterproof in normal riding conditionsWith a protective outer made from waterproof Polartec® NeoShell® 4-way stretch fabricInner formed from warm, breathable Polartec® Alpha® insulationThe two layers have separate double-opening zips, so you can open one, both or neither to regulate the ventilation and temperatureExternal seam taping for near waterproof status, while no-sew bonded hem seals out windAnatomically shaped cuff integrates with gloves3 rear pockets, secure zippered side pocketReflective areas at lower back, shoulders and around wristsWeighs 371g (large size)For use at temperatures from -5-12°C, 23-54°F