Story A lightweight down-alternative jacket with technical flair Our PROOF design knows that when it comes to perfecting an insulated jacket—it’s the inside that counts. The team opted for 40 grams of water-resistant PrimaLoft to help keep the jacket as breathable as possible without sacrificing warmth. (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.) The shell of the jacket is treated with a durable water repellent (DWR), and blended with a touch of spandex to help keep its shape and allow gentle flex. Combine all these technical elements with the fact you’ve got a pack-friendly design (it can roll up for storage in a daypack), streamlined zip pockets, and a soft quilted liner, and you’ve got a damn good full zip primed for impromptu, one-bag-travel trips. Feature Hem cord lock system and elastic binding at cuffs to keep in warmth Interior media pocket on wearer’s right side Front left chest hidden zipper pocket 2 front side entry pockets at the waist with zipper closures Durable water repellent exterior (DWR coating) Cord zipper pulls with silicone dipped puller ends Quilted Interior Standing collar YKK zippers Hanging locker loop Sizing The AltoLoft Insulated Full Zip 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 - Chest: Measure straight across from edge to edge, starting 1" below the armhole, multiply by 2 - Shoulder: Measure straight across from shoulder seam to shoulder seam. Again, it’s easiest to measure across the back of the garment - Body Length: Start at the top of the shoulder where it meets the neck seam, and measure straight down to the hem - Sleeve Length: Start at the center of the back of the neck, measure straight across to the shoulder seam, and then follow the edge of the garment to the cuff. Pro tip: it’s easiest to measure across the back of the sleeve Materials & Care Body: 94% Nylon, 6% Spandex, 118 GSM Lining: 88% Nylon, 12% Spandex, 95 GSM Sleeves: 100% Recycled Polyester Insulation: 40g PrimaLoft 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. The Sweat Test Guarantee Put your new Proof gear through its paces. If it does not meet your expectations, we'll accept your dirty laundry and issue a refund, no questions asked. Terms and limitations here
