Omega one-piece Expedition shell

A fully taped oversuit to cover down-filled expedition clothing. Provides the ultimate barrier against the full force of the weather. Now available in custom sizes.
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
1000g / 35oz
Omega one-piece Expedition shell suit


  • Waterproof HS3 fabric shell with fully taped seams
  • 6 pockets:
    • 2 cargo pockets
    • 2 handwarmer pockets
    • 2 inner water-bottle pockets with elasticated entry
  • Front zip:
    • 2 way, 'under and up' through crotch and up back for toilet access
    • double baffle with full velcro closure
  • Short Side zips: ankle to knee
  • Hood:
    • large size with rear volume reducer
    • adjustable non stretch face cord with cord end channels
    • adjustable front velcro closure
    • wired peak
    • sewn on
  • Arms and knees articulated
  • Crampon patches
  • Elasticated waist and back for snug fit
  • Internal braces - adjustable for varied clothing - removable
  • Mitt attachment loops at waist
  • Reflector tape for night location
  • Beard flap
  • Cuff: Velcro adjustable cuffs to go over any Jacket / Mitt combination
  • Please note: this suit is currently being offered in all red, not red and black as pictured
  • Set Options:
    • Down fit – full size to cover down gear (e.g. down suit or Jacket / Trouser combination)
    • Fleece fit – slimmer fit to cover fleece / softshell etc.
    • Velcro patches on chest - for quick attachment of mitts or logo badges
    • Pit zips: water-resistant YKK Aquaseal
    • Rainbow seat zip as alternative for toilet use



A fully-taped oversuit designed as the top layer for full expedition clothing, with a wide cut to fit over down garments (also available in slimmer 'fleece-fit').  The Omega represents expedition outerwear at its most protective.

A formidable list of technical specifications includes: 6 pockets to stow kit while on the move, double storm baffles, Velcro cuffs to adjust to any Jacket / Mitt combination, and toilet access options to mirror your suit or salopettes.

Available in two cuts:

  • Down fit – full size to cover down gear (either a down jacket and trousers or a full down suit)
  • Fleece fit – slimmer fit to cover fleece/pile etc.

Our wind proof and water resistant Xero shell suit is a lighter option for those not requiring the complete protection offered by HS3 fabric and fully-taped seams.

Also available in custom sizes. We make clothing to order, so if you’re not a standard size we can make it to fit. To order a non-standard custom size, select the Custom Sizing tab and choose the body width, body length, inside leg and arm length sizes that work for you. A custom size takes us a little longer (typically two weeks longer) to make and, because it’s personalized, it’s non-returnable and our customer loyalty scheme can’t be applied.

Please note: this suit is currently being offered in all red, not red and black as pictured.

Toilet access on suits

  • Under & Up zip: The central front zip on the suit runs from the collar, down the front of the body, past the groin and then under and up to waist level at the back. A two-way zip allows access at any place.
  • Rainbow Seat zip: A rainbow / semicircle zip is sewn in across the backside. A two-way zip allows access and creates a drop down flap.
More on toilet access.

Waterproof HS3 outer fabric (weight: 115 gsm)

HS3 is a 3-layer laminate, the new fabric for our Alpamayo shell gear. The old argument that a 2-layer fabric with a separate mesh inner was both more flexible and more breathable than a 3-layer has been overtaken by the performance of current 3-layers such as HS3. This new ripstop fabric also removes the disadvantages of mesh (which snags on velcro and can form an ice-trap in extreme cold) and makes the gear considerably lighter. HS3 is fully waterproof and offers excellent breathability.

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