Arc'teryx Alpha SL Anorak vs Black Diamond Fineline Stretch Shell
Weight and specs compared for 2026 — and which one to choose.
Minimalist ultralight Gore-Tex Pro hardshell, 10.8oz, emergency weather protection
4-way stretch waterproof shell at 11.3 oz (320g) for men, featuring stretchy fabric for climbing and technical movement.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Arc'teryx Alpha SL Anorak vs Black Diamond Fineline Stretch Shell: which should you buy?
If saving weight is your priority, the Arc'teryx Alpha SL Anorak wins — at 305 g it is 15 g (5%) lighter than the Black Diamond Fineline Stretch Shell (320 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest clothing - outer layer page, or browse the full gear weight database.