I bought this jacket as I wanted something relatively lightweight but strong enough to withstand some abuse. I often will do aggressive hikes through heavily forested areas and have had lightweight shells rip while hiking thru trees. The e-vent membrane keeps up with my excessive heat output (read: pre-menopausal hot flashes) and is sturdy enough for year round use. I bought Large as I wanted the versatility of wearing it 4 season. I also have a small dog and wanted something that would stand up to picking her up on cold/yukky days without seeing much wear and tear. I'm debating buying it in black as well now as the teal gets dirty soooo quick.