We only use dive grade neoprene – no compromise.

Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad.

Squeeze a ripe tomato and what do you get.  This same logic applies to neoprene.


Soft = Compression = Collapse = Cold

Before buying your Semi Dry, feel it, squeeze it, stretch it.
If it feels like a piece of elastic, lacks density and guts, it will let you down in more ways than one.

If you are serious about diving and you want a Semi Dry to suit,
then look no further.

Sticking to our beliefs in what we know about neoprene and diving suits in general, we have made clever use of modern technical fabrics and the latest technology in seal skin finishes to make this semi dry the best we’ve ever made.

Will Goodman put this suit to good use achieving a world record CCR dive in 2014.

Following a years training Will descended to a record depth of 290m, although because all the gauges stopped at this depth, it is believed that he actually achieved over 300m.

This suit can be worn from early summer through to mid September here in the UK
(14°c – 18°c) and comes into its own in the winter Red Sea and the Mediterranean.

By adding the O’Three Deep Skin Short John, this temperature range can be increased.

6x5SD Blue Accent Graphics | £199.95

6x5SD Gold Accent Graphics | £199.95


  • The Neoprene: The most critical element of any suit.  The neoprene we use gives a high degree of comfort and flexibility, whilst minimising compression, maximising its recovery, therefore keeping you warmer for longer.  O’Three’s 6 x 5 Semi Dry uses three densities of quality dive grade neoprene.
  • The Fabrics: In order to capitalise on the quality of the neoprene, we need to laminate it with the best fabric combinations.  From the durable 210D fabric used on the seat and front of the legs, to the Grid Plush used internally throughout the Torso, no fewer than 8 different linings have been utilised, each having a specific function and job to do.
  • The Cut: Tailoring and ergonomically shaping remain a priority.  Get it right and the detail in marrying the Neoprene and Fabric combinations will come into their own.
  • Thickness: 6mm Body, 5mm Arms and legs.
  • Grid Plush: Internally the torso has been laminated with Grid Plush.  This new material combines fibres and a unique weaving technique that will increase warmth and speed up drying times.
  • Seams:  Triple glued and blind stitched, resulting in watertight seams.
  • Stretch Panels: A careful combination of supply neoprene and ultra-stretch linings tailored into key areas giving additional flex and comfort.
  • 210D – Fabric: A tried and tested version of the material we use on our Ri2-100 Dry Suit.   210D has been used on the rear and knee / shin panels.
  • Sea seal: Pressure fit glide skin wrist seal.
  • Floating Collar: A soft micro mesh combined with a super ultra-stretch lining resulting in a neck seal that floats and contours your neck like no other.  Adjustable Velcro closure.
  • Zip: YKK HD metal slider back zip.
  • Storm Guard: 1mm super ultra-stretch neoprene barrier subtly positioned behind the zip panel creating a 100% waterproof guard.
  • Colour choice: All black, with the option of Blue or Gold graphics.


Dive / Surface Neoprene – The difference and why you should be concerned.

Please take a little time to read and think about what is explained below, before you buy a wet / semi dry suit for diving.

Neoprene was invented by DuPont in 1930 and remains the best thermal insulator for any water sport, above or below the surface. As you would expect, neoprene has evolved in those 85 years. Refined techniques and huge investment has created a range of Neoprene suitable for applications from Running Tracks to Triathlon Wetsuits.

The vast majority of people who enjoy water-sports and wear a wetsuit remain at the surface.

The demand for extreme flexibility and movement has been and remains the overriding factor for the surf and surface water sports industry.  It is this sector that has been driving that neoprene evolution.

We have neoprene available today which has been specifically developed to be super light and ultra-soft, which is then laminated with ultra-stretch super extend materials, that has quite simply surpassed what any of us in the industry thought could have been achieved only 8 to 10 years ago.

However, it is only diving that inflicts a sustained compression on your neoprene product.

It is the thickness of the neoprene that is your insulator.   The softer the neoprene, the thinner it will become at depth.   A really soft 5mm suit will be half its thickness at just 2 meters (6feet).   At 30 meters it’ll be paper thin.

Softer neoprene will allow over stretching, creating thin spots even before you get under water.

Softer neoprene will not recover from compression.

The longer and deeper your dives, the quicker this will happen.

O’Three use several types of neoprene.  The vast majority of which have been developed specifically for diving.  These neoprenes have more mass and strength, whilst remaining flexible and comfortable.

It may take a little longer to don and doff and therefore to sell an O’Three semi dry, but we will not compromise the diving grade materials we use.  Ultimately, it is these materials that are helping to keep you warm and in the most extreme circumstances alive.

Size Guide

Unisex Size Guide

Small5’4" - 5’6"
162 - 167cm
34" - 36"
86 - 91cm
27" - 29"
69 - 74cm
32" - 34"
81 - 86cm
Medium5’8" - 5’10"
172 - 177cm
38" - 40"
97 - 101cm
31" - 33"
79 - 84cm
36" - 38"
91 - 97cm
Medium Tall5’10" - 6’0"
177 - 182cm
38" - 40"
97 - 101cm
31" - 33"
79 - 84cm
36" - 38"
91 - 97cm
Medium Large5’10" - 6’0"
177 - 182cm
40" - 42"
101 - 107cm
33" - 35"
84 - 89cm
38" - 40"
97 - 101cm
Large6’0" - 6’2"
182 - 187cm
42" - 44"
107 - 112cm
35" - 37"
89 - 94cm
40" - 42"
101 - 107cm
Extra Large6’2" - 6’4"
187 - 193cm
44" - 46"
112 - 117cm
37" - 39"
42" - 44"
107 - 112cm
2XL6’3" - 6’5"
189 - 196cm
46" - 48"
117 - 122cm
39" - 41"
44" - 46"
112 - 117cm
3XL6’4" - 6’6"
194 - 198cm
48" - 50"
122 - 127cm
41" - 43"
46" - 48"
117 - 122cm

Please be aware these sizes are for guidance only.

O’Three use only the best neoprene.  Its super supple qualities will ensure that all of the measurements above will have a degree of leeway.

If you are not sure on the size that you might require, please do not hesitate to give us a call on 01305 822820 or use our contact form here.