Story A snap shacket that delivers on-demand warmth Creating a cozy, insulated layer that’s breathable takes a village, and the PROOF design team confidently rose up to the challenge. The AltoLoft Insulated Shirt Jacket delivers on-demand warmth in a style-friendly jacket cut—ideal for city-to-trail travel. Its nylon shell is treated with a durable water repellent (DWR), and blended with a touch of spandex to help the jacket keep its shape and allow gentle flex. For the insulation, a 40 grams of PrimaLoft insulation is tapped, helping keep the jacket as breathable as possible without sacrificing warmth, while also delivering water-resistant insulation that’s lighter and tougher than traditional down. (By the way, PrimaLoft was actually first developed for use by the US Army in the early 1980s, and the insulation worked so well that outdoor brands poached the technology for themselves). Combine all these technical elements with the fact you’ve got a pack-friendly design (it can roll up for storage in a day bag), ample pocket space, and a soft quilted liner, and you’ve got a damn good snap layer that’s up for anything. Features Durable water repellent exterior (DWR coating) Quilted Interior Concealed front zipper pocket on left chest 2 front side entry pockets at waist with zipper closures Hanging locker loop Materials Body: 94% Nylon, 6% Spandex, 118 GSM Lining: 88% Nylon, 12% Spandex, 95 GSM Sleeves: 100% Recycled Polyester Insulation: 40g PrimaLoft Sizing The AltoLoft Insulated Shirt Jacket has a regular fit that’s true to size, take your normal size For the absolute best personal fit, compare your best-fitting jacket to the garment measurements below Garment Measurements XS S M L XL XXL Chest 41 43 45 47½ 50 57½ Shoulder 18 18½ 19 19⅝ 20¼ 21⅛ Body Length 27¾ 28¼ 29 29¾ 30¼ 31 Sleeve Length 34 34¾ 35½ 36¼ 37 37¾ All measurements are in inches. How to Measure - Garment Chest: measure on a shirt from side to side starting 1” under the armpit, multiply by 2 - Shoulder Width: measure on a shirt straight across the shoulder from seam to seam - Body Length: measure on a shirt from the high shoulder to the bottom hem - Sleeve Length: measure on a shirt from the center back to the cuff opening Care Machine wash cold on delicate cycle with similar colors Do not bleach Hang to dry Iron low heat About PROOF Sprint and catch that train. Bike to your next meeting. Stretch out on that international flight. Thanks to innovative technical fabrics and thoughtful design, PROOF's clothing is smart, technical apparel rises to every occasion. Designed for work, play, and travel, PROOF updates everyday essentials with the latest performance fabrics and construction techniques to help you get more out of your clothing — so you can get more out of yourself.
