Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Brands

Knives and Multitools

SOG Ultra XR

The lightest knife of 2021.

Lock Icon

Unlock this article and more benefits with 25% off.

Already have an Outside Account? Sign in

Outside+ Logo

25% Off Outside+.
$4.99/month $3.75/month*

Get the one subscription to fuel all your adventures.


  • Map your next adventure with our premium GPS apps: Gaia GPS Premium and Trailforks Pro.
  • Read unlimited digital content from 15+ brands, including Outside Magazine, Triathlete, Ski, Trail Runner, and VeloNews.
  • Watch 600+ hours of endurance challenges, cycling and skiing action, and travel documentaries.
  • Learn from the pros with expert-led online courses.
Join Outside+


*Outside memberships are billed annually. You may cancel your membership at anytime, but no refunds will be issued for payments already made. Upon cancellation, you will have access to your membership through the end of your paid year. More Details

The Ultra XR is one of the slimmest and most compact knives we’ve ever used. SOG upgraded the original version with a higher-quality stainless steel that prolongs the 2.8-inch blade’s edge without sharpening and resists chipping and corrosion. During six months of use, which included cutting kindling, food prep, and box opening, the Ultra XR never dulled and proved adept at detailed work. An XR lock (SOG’s proprietary mechanism) allows single-handed opening, and doesn’t budge under up to 1,500 pounds of pressure (so claims the product manual; we leaned hard on it without feeling it flex). The carbon-fiber handle is thin (6.5 millimeters) but provides a comfortable grip, and the pocket clip doubles as a credit card and cash holder.

When you buy something using the retail links in our stories, we may earn a small commission. We do not accept money for editorial gear reviews. Read more about our policy.