Sender Harness
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Sender Harness
Details
- 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
- Buckles
- single self-locking
- Gear Loops
- 4
- Ice Clipper Slots
- 4
- Haul Loop
- 3kN
- Chalk Bag Hanger
- attachment
- Claimed Weight
- 11oz
- Manufacturer Warranty
- 2 years
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 17 ratings
Review Summary
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.Customer Images
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Selecting an option will reload the available reviews on the pageOctober 27, 2025
Comfy sport climbing harness
Works great, pops with the color if your into that

Originally reviewed on ExpertVoice.com
October 16, 2025
Light as could be
Very light harness that is great for sport climbing. Enough space on the gear loops for all of your draws and anchor material. The gear loops also have like a plasticy finish to them which makes them stiff and easy to rack and unrack your gear. It’s a little snug for its size but not prohibitively so, I just need to pay attention when I put it on other wise my shorts or pants will ride up in it. Orange is a cool color too!

Originally reviewed on ExpertVoice.com
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.

Originally reviewed on ExpertVoice.com
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 ExpertVoice.com
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.

Originally reviewed on ExpertVoice.com
April 11, 2023
Lightweight harness that keeps it comfortable. As always with Mammut, quality is excellent.

Originally reviewed on ExpertVoice.com
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 ExpertVoice.com
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.

Originally reviewed on ExpertVoice.com
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 ExpertVoice.com
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 ExpertVoice.com
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