Here's what other sites are saying:
Crafted with a lightweight, heat-packing soft shell, the men's ARCTERYX Proton FL insulated Hoodie balances breathability with thermal protection for summer alpine and rock climbing. The low-profile, fitted and adjustable hood provides wind protection and fits under a helmet, while 2 stretch-woven zippered chest pockets and 2 zippered handwarmer pockets keep essentials close at hand.
- Mountain Gear refers to the men's version
Arc'teryx Men's Top Proton Fast and Light Hoody - Men's Black Large 370170. The Fortius Air 20 fabric has light wind resistance and air permeability while Octa Loft breathable insulation maintains a comfortable micro climate. A low profile fitted adjustable hood is uninsulated to fit well under a helmet but still give wind protection. Featured with two zippered chest pockets and two zippered hand warmer pockets.
- CampSaver.com refers to the men's version
The Arc'teryx Proton FL Hooded Insulated Jacket provides an excellent balance between air permeability and thermal protection when you're alpine or rock climbing through the warmer months. Its Fortus Air 20 fabric offers light wind-resistance while still allowing air to pass freely so you don't get overheated. Its Octa Loft insulation is breathable and still keeps you warm in those cool alpine temperatures. Designed with climbing in mind, the Proton FL features zippered chest pockets that are easily accessed while wearing a harness. Additionally, the dual hem adjustments keep the jacked tucked under your harness while you reach for high holds. And weighting in at under 10oz, the Proton FL keeps you fast and light on your alpine and climbing adventures.
- Backcountry.com refers to the men's version
The Arc'teryx Men's Proton FL Hoody is a super lightweight insulated jacket designed for Climbing. Featuring Fortius Air 20 face fabric and air permeable synthetic Insulation, this Softshell jacket provides an optimal balance of breathability and warmth. It really shines as an outer layer during any High-output activity and with its trim Fit profile, it layers easily under a shell in more extreme, stop-and-start conditions. Features of the Arcteryx Men's Proton FL Hoody Fortius Air 20 balances air permeability with light wind resistance Octa Loft, clean finished, breathable Insulation provides thermal protection while maintaining a comfortable micro climate Low profile, Fitted, adjustable uninsulated helmet compatiblehood provides wind protection Two stretch woven zippered chest pockets and two zippered hand warmer pockets Dual hem adjustments and HemLock keep the jacket tucked under harness while Climbing Fabric Details Fortius Air 20 Octa Loft breathable Insulation - 100% Polyester
- Moosejaw refers to the men's version