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 The Crux is officially retired.You've found a page of history! The Crux is no longer produced by Singing Rock and it is not available to buy from major online retailers. You can still check out all the specs and claim your ownership.

Singing Rock Front
  • Singing Rock Front
  • Singing Rock Back
  • Singing Rock Belay Loop
  • Singing Rock Leg Loop


Singing Rock


My vote: None ( 6 avg )


Ultralight high-performance climbing harness designed for sport routes
or wherever you want to climb light

innovated lightweight construction of the waist belt and leg loops provides maximum support and comfort
patented Rock&Lock buckle on the waist belt for fast and safe adjustment
tie-in points which have the most abrasive wear are reinforced by PAD webbing
perforated EVA foam inside the waist belt and leg loops with holes 5mm in diameter increases the breathability of the harness
padded waist belt and leg loops made from breathable PES fabric with high abrasion resistance
inside mesh dissipate moisture and dries quickly in a wet conditions
laced technical textile increasing the waist belt rigidity and abrasion resistance
4 braided gear loops with a load capacity 5 kg
colour belay loop for proper tie-in/attachement point, strength 15 kN
fixed bridge between the leg loops provides a higher safety in case of wrong tie-in
ergonomic and simple design
BMI adjusting system for perfect fit when changing the layers or weight

Retail price

US$ 44.95
Weight (g)


In grams, the weight, as stated by the manufacturer/brand.

If there are differences in weight (due to multiple sizes or optional accessories) we'll list them here.

The default weight is the middle-most size, often this is size M.

325 g

M : 325 g / 11.5 oz
(At this time Singing Rock only gives out the weight for Size M)
(weight converted from grams to ounces)

Gender Unisex
Sizes XS, S, M, L, XL
Gear Loops

Number of Gear Loops

Gear loops are used to hold gear (quickdraws, cams, etc) onto your harness. 4 gear loops is most common.

0 - 1 Gear Loops

Most often on full body harnesses or guide/gym style harnesses.

2-3 Gear Loops

Mostly found on lighter harnesses made for [ski] mountaineering or high-end sport climbing where weight is a high priority.

4 - 5 Gear Loops

The standard/most common number for climbing harnesses. Perfect for sport and trad.

More Than 6 Gear Loops

Designed for long multi-pitch and big wall climbing, found on harnesses made to hold the maximum amount of gear.

Worth Considering

Occasionally, the number of gear loops will change on a harness model depending on the size. There could be 7 gear loops for the med/large but only 5 gear loops for the xsmall/small. In this case we list the highest number for the filters, and then write an explanation on the product page like, “Size S/XS can only fit 5 gear loops.”

4 Gear loops
Ice Clip Slots

Ice Clip Slot

Ice clipper slots are made to fit a carabiner that holds ice screws. These slots are generally only used by ice climbers but there is no disadvantage to having them on your harness.

Less than 40% of harnesses will have ice clipper slots. And those harnesses will usually have 2 or 4 slots, often located next to, or between, the gear loops.

No, 0
Belay / Tie-In One Loop
Waist Buckle Type Quick Adjust
Leg Buckle Type None (it stretches)
Drop Seat Yes
Haul Loop

Haul Loop

Trad climbers often look for a haul loop as they're intended to haul a rope (second line) or pack (while you climb the chimney).

A haul loop can also hold shoes or other accessories. Although not the intended use, it is also commonly used to hold a chalk bag.

No  (0kN)
Certification CE, EN, UIAA
Size Chart

Waist : 65-75 cm / 25.5-29.5 in
Legs : 49 cm / 19 in
Waist : 70-80 cm / 27.5-31.5 in
Legs : 52 cm / 20 in
Waist : 75-85 cm / 29.5-33.5 in
Legs : 55 cm / 21 in
Waist : 80-90 cm / 31.5-35.5 in
Legs : 58 cm / 22 in
Waist : 85-95 cm / 33.5-37.5 in
Legs : 60 cm / 23 in

Singing Rock Harness Testing

Along with some metal music, you can see how Singing Rocks tests their harnesses to ensure they meet UIAA standards.

Singing Rock Harness

This video shows how to wear Singing Rock Harness correctly.

No reviews yet.

Climbing Gear Review

Simplicity is the focus of the Singing Rock Crux. This lightweight rig was praised for its comfortable fit on both men and women. At 10.6 oz., the Crux is lined with 5mm perforated EVA foam for slightly cushier hangdogs (for both the projecter and belayer) than the most stripped-down ultralight harnesses. One tester said it “was a pleasure to fall in.” The waist belt is more rigid
than on the other harnesses we tested, providing more support when hanging. And “the fixed leg loops don’t twist easily, so you just step through and zip the buckle,” one tester reported. Singing Rock’s Rock&Lock auto-doubled-back buckle makes waist-belt adjustments quick and easy. The four gear loops aren’t encased in plastic, but they’re stiff enough for clipping and
unclipping draws easily. For several climbers, the fixed leg loops tended to ride up, causing a little groin discomfort for male belayers. Nonetheless, at less than $50, this is the best-fitting bargain you’ll find.