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Sender Harness

4.533333333333333 out of 5 stars
15 Reviews
Color:Safety Orange


Size Chart


Sender Harness

Mammut's Sender series consists of high-performing climbing gear for all styles of ascent, and the Sender Harness is hyperlight and geared for all-around sending. It has that light, breathable, free-moving design that sport climbers love to fall into when they're projecting, and it's extremely packable for mountaineers and ice climbers. Mammut added four attachments for ice screws, and there are two rigid gear loops and two webbing gear loops for cams and quickdraws, and Mammut added a haul loop and chalk bag attachment for a full arsenal of climbing gear for whatever route you want to send.


  • Ultralight climbing harness built for senders
  • Split Webbing technology ensures solid security at less weight
  • Laser-cut fabric enhances breathability and ventilation
  • Single self-locking buckle at waist, elastic leg loops
  • Tie-in loop reinforced with plastic and wear indicator
  • Four gear loops and four attachments for ice screws
  • Item #MAMU51U
single self-locking
Gear Loops
Ice Clipper Slots
Haul Loop
Chalk Bag Hanger
Claimed Weight
Manufacturer Warranty
2 years

Overall Rating

4.5 based on 15 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 3 reviews
5 Stars - 11 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

July 16, 2023

Very comfy, prefer the nonadjustable leg loops to the adjustable ones. Wear indicators are a good idea, just a good sport climbing harness.

user image

Originally reviewed on

5 out of 5 stars

June 23, 2023

Sender sends it

As expected for the Sender line this is a super lite harness. And as expected from Mammut the quality is top notch

Originally reviewed on

5 out of 5 stars

June 8, 2023

Great harness

Amazing harness for all around climbing. I used it for ice, sport and trad and I've always been satisfied. Comfortable and lightweight, a good harness.

Antonin S

Originally reviewed on

5 out of 5 stars

April 11, 2023

Lightweight harness that keeps it comfortable. As always with Mammut, quality is excellent.

Originally reviewed on

5 out of 5 stars

February 23, 2023

Super Sport Harness

A super harness that is lightweight, with everything you need and none of the frills you don't. I've used it mainly sport climbing and it easily fits all of my draws on the gear loops. The single adjustable belt loop and elastic on the leg loops make the harness easy to put on/take off, and make for a comfortable experience. The provided storage bag is an awesome added bonus and the bright orange colour makes you easy to spot for all those cool climbing pics!

Originally reviewed on

5 out of 5 stars

December 4, 2022

Works exactly as expected

Fantastic harness which holds to my hips really well. Used on several outdoor climbs and in the climbing gym on a weekly basis. Have zero faults with it so far. Took me some time to get used to the elastic but now that I am familiar with it compared to my old webbing only harness I really like it.

Stephen D

Originally reviewed on

5 out of 5 stars

October 24, 2022

Harness is super light and very comfortable. Previous harness was the 4 slide from Mammut, I didn't realize how bulky it was until I upgraded to this one. The chalk bag attachment is a little funky, if you use a biner to attach your chalk bag to the back of the harness, you'll need to find an alternate solution because it'll twist. Either a belt or the Mammut Crag Sender chalk bag work well.

Originally reviewed on

4 out of 5 stars

October 6, 2022

Comfortable harness

This is a great sport climbing harness that has been super comfortable. I've had it for about a year and have spent many hours hanging in this thing. It is really comfortable, lightweight, and functional. Love the thick belay loop with the indicator warning feature. My only complaint about this is that the gear loops are a little floppy and don't stay cantilevered off the harness very well for easy access to draws and pro. Other than that, this is a great harness that I highly recommend.

Originally reviewed on

5 out of 5 stars

February 12, 2022

Every feature you want in a harness!

This harness is my everyday favorite. Love the fit and the way the buckle slides tight with no hassle. The gear loops are great and look like they'll last forever. The legs are comfortable and flexible. All around great harness for sport climbing.

Originally reviewed on

5 out of 5 stars

February 5, 2022

Super comfortable and high performance

This is the best and most comfortable harness I have ever owned. I especially love the attention to details such as the subtle shape in the gear loops to push the quickdraws forward. Also the wear indicator in the belay loop is nice. Its given me lots of soft catches and I will definitely buy again.

Joseph E

Originally reviewed on