Outdoor gear is awesome, but it’s also typically expensive. The REI Anniversary Sale cuts 25% or more off brands like KEEN, Oboz, Smartwool, NEMO, Big Agnes, Mountain Hardwear, Outdoor Research, and Black Diamond, and The North Face. The window runs May 15 through May 25, which is shorter than most retailer sales and a lot easier to plan around than something like Memorial Day weekend. The deepest discounts in the whole event are a members-only …