A new harness on the market by Mammut, the Sender is their performance sport climbing harness. Equipped with plastic protection on the lower tie in and indicator stitching, there are a lot of things to like on the new Sender. At only $100, we wouldn’t call it a starter harness, but if you are an experienced climber looking for a tailored harness for sport climbing, this is the one. There are four loops compatible with ice tool clippers so it is also versatile.

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See Our Best Climbing Harness Review 2021

Design

With a Slide-Bloc buckle that feeds the waist belt strap into well-placed keeper loops, the waist belt uses Split Webbing technology to keep the weight down but improve comfort along the back and waist of the wearer.

The leg loops are fixed but have an elasticated front band to allow for freedom of movement while climbing. They also have lots of venting to remain highly breathable. This is thanks to a laser-cut fabric that maintains durability but improves airflow. The lower tie in point is protected by a plastic guard to improve durability and reduce the wear of the belay loop and tie in points. The tie in points also have indicator stitching to show when the harness will need to be replaced. However, with the durable design features, the service life of the harness should be quite long, depending on any major incidents.

Comfort

Using Mammut’s Split Webbing technology (we’ve heard this term before), the harness has two pieces of webbing that run along the waist belt that is covered in a stretch mesh laser cut fabric. The main goal of the dual webbing is to reduce pressure points and keep the wearer comfortable. This harness succeeds at this task, and the Sender is comfortable and quite breathable, which is great for climbing hard in warmer climates. There is venting along the leg loops as well, which is always a nice touch.

The leg loops are connected with webbing to keep them organized and from riding up your legs too often while in a hanging belay. This harness is directed at performance climbers going for big objectives, so it is light. Do know that this may impact overall comfort, but the design is sound and the comfort is there overall.

Gear Loops

The Mammut Sender comes fully equipped to get you up your sport, trad, or ice climb. There are four gear loops; the two front loops are pre-shaped plastic to support a surplus of quickdraws and allow for easy access. The rear two gear loops are soft and lightweight to carry additional gear without adding too much excess weight.  

There is a haul loop at the back of the harness that is rated for 2kN of force. There is also an independent loop for a chalk bag at the top of the waist belt at the rear of the harness. The list of additional accessories continues as the Sender also has four ice tool clipper loops. So this harness is ready for any adventure in any climate, be it sport climbing in the Moab deserts or ice climbing in the Canadian Rockies.

The Bottom Line

The thought that has gone into the Sender is apparent. There is a lot of attention to detail, and that makes this harness one of the most versatile on our list for harnesses in 2021. At a price of only $100, the versatility that the harness provides makes it a very wallet-friendly harness as well.

The design and functionality make it a good one-quiver harness, but the fixed leg loops don’t make it a great harness for the alpine if you need to slip on a harness over crampons or ski boots. The harness is absolutely a performance sport climbing harness. It’s light, moves well, and is highly breathable, which is perfect for hard sport climbing. It is a very new harness so time will tell how the masses feel about it, but right now, this harness is a contender for the Best Sport Climbing Harness of 2021.

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