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Ocun Sigma Climbing Shoe

Built to conquer the most challenging routes

Sale price$339.95

Size: 5 UK
Sizing Chart: Ocun Climbing Shoes

Jump To Mitch's Experience wearing Ocun shoes

Tips for sizing your foot correctly:

Please note that Ocun has specifically designed their shoe sizes to remain consistent across the board. This also means that if you usually aggressively downsize in other brands, that won't be helpful here.

  1. Using a tape measure for best accuracy, measure from heel to toe and compare to the MM section. Round up if in between sizes.
  2. Stick close to your street shoe size:
    • if you are wanting a tighter fit, only go down half a size.
    • If you are wanting more comfortable shoes, go up half a size.
  3. Choose the UK sizing when ordering

 

UK EUR MM
2 33 210
2.5 34 215
3 35 220
3.5 36 225
4 37 230
4.5 37.5 235
5 38 240
5.5 38.5 245
6 39 250
6.5 40 255
7 41 260
7.5 41.5 265
8 42 270
8.5 42.5 275
9 43 280
9.5 44 285
10 45 290
10.5 45.5 295
11 46 300
11.5 46.5 305
12 47 310
13 48 315
14 49 320
15 50 325

Sizing feedback from Mitch:

Foot Profile:

  • Measured foot size: 253mm - rounded up to 255mm (6.5UK).
  • Cube style toes 
  • Average width.

Wearing a Bullit in 6.5UK:

  • My foot felt very snug.
  • Heel actively pushing toes into end
  • Minor pain on edges of toes after 30mins.
  • This is a comfy performance fit.

Wearing a Havoc in 6.5UK:

    • Foot still feels snug but less pushing in the toes as the heel in less pre-engaged.
    • Still feels somewhat of a performance fit.

Wearing a Fury in 6.5UK:

      • I struggle to get my foot in the shoe
      • Once I do, it's very tight.
      • Pain after 10mins in toes, particularly pinky toes.

Wearing a Ozone in 6.5UK:

    • Shoes are hard to get on, less difficult than Fury. 
    • Once on are more snug than the Bullits.
    • Pain after 20mins in the pinky toes.
    • This is a true performance fit.

Yes, I wear a lot of shoes...  back to top?

Size

In stock
Unsure about sizing?

Follow our sizing chart to ensure you get the right fit!

Description and Tech Specs

This shoe is meant for the hardest rock climbs. Its unique midsole consists of two parts to give you unparalleled support - not only at the tip of the shoe, but also under its arch. The mid part of the sole is designed to be thinner than usual to allow for high sensitivity and perfect fit. The overall stiffness provides maximum confidence in technically challenging moves.

  • Elaborate design of the sole for uncomparable support and sensitivity
  • 3D toepatch for toehooking
  • Flat laces, tongue pocket for laces
  • Soft, thin microfiber for maximum comfort and lightness
Asymmetry

High Asymmetry

Downturn

Highly Downturned

Stretch

Very Little

Closure System

Laces with lace pocket

Upper Composition

Microfibre

Midsole

3D Fit Hard

Sole

4mm of Vibram XS Grip

Compare Between Models 👟

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Recommended For

Indoors, Bouldering, Outdoors

Outdoors & Indoors

Indoors, Outdoors & Multipitching

Downturn & Asymmetry

Highly asymmetric & highly downturned

Highly asymmetric & highly downturned

Medium asymmetry & slightly downturned

Rubber

4mm Vibram XS Grip

4mm Vibram XS Grip

4mm CAT 1.5 Rubber

Toe Patch

Yes, full length CAT 1.5 Rubber

No

No

About the brand

Ocun produce equipment that provides the best climbing experience, always striving for improvement and innovation by bringing a precise engineering approach to function and safety of climbing gear design.

Over the years, Ocun has been behind some large innovations which people forget about, including:

  • The seamless heel first invented by Ocun, now used universally in all climbing shoes
  • Crack gloves we all know and love
Shop Ocún

About the brand

Ocun produce equipment that provides the best climbing experience, always striving for improvement and innovation by bringing a precise engineering approach to function and safety of climbing gear design.

Over the years, Ocun has been behind some large innovations which people forget about, including:

  • The seamless heel first invented by Ocun, now used universally in all climbing shoes
  • Crack gloves we all know and love
Shop Ocún

What others say about us