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Call us 24/7 +44 01482 876999
Call us 24/7 +44 01482 876999

Across three decades of unflinching commitment to quality, reliability, and unequalled attention to customer care, O’Three dry suits have earned a unique place in the hearts of recreational, technical, commercial, and pioneering explorers across the globe.

A 5mm Neoprene dry suit, tailored properly and dived with the correct under-suit has been at the core of O’Three’s 32-year journey and our success. These suits have become symbols of strength and reliability throughout the diving world.

Driven by our passion and respect for these originals, O’Three’s New MF5 delivers exceptional insulation, increased comfort, flexibility, and durability. 
Not anchored in our past, but remaining true to our heritage, O’Three’s New MF5 will continue to provide todays diver with dependable service year after year.

Complete and ready to dive


The MF Material

We continue to make full use of the combination of quality 5mm dive grade neoprene and the externally laminated ‘multi stretch fibre’.

Quality 5mm dive grade neoprene producing a substantial amount of insulation.

The MF Material

The 2.5mm flex panelling which runs from the waist up into the bicep and the entire fore arm means movement and flexibility has been increased.

The MF5 - built-in insulation externally laminated multi-stretch fiber versatility is it's key to success quality dive grade neoprene

MF5 Drysuit Specification

  • Male and Female versions available.
  • Material: 5mm Multi Stretch Fibre lined quality pressure resistant neoprene.
  • Neck: 2.5mm Micro-Mesh, comfortable super-stretch
  • Valves & Hose: Apeks Low profile Auto Dump, Swivel Inlet & hose.
  • Zip: Heavy Duty BDM riveted dry zip. Medium duty on Ladies for added flexbility.
  • Zip Guard: Additional protection to that all important zip
  • Graphics: Anti-abrasion PU
  • Wrists: Long and contour hugging Xstend stretch wrist seals.
  • Pocket: Cargo25 with built-in slate pocket and D-rings
  • Seams: Bonded, chemically cured and internally reinforced with nylon backed neoprene cover tape
  • HD Boot: Super warm contoured foot. Strengthened sole combining an ergonomically reinforced upper and
    heel, with a built in fin stop.

Complete & ready to dive

Your suit comes complete with the following

  • Quality suit bag
  • Changing Mat
  • Vented Semi-dry hood
  • Jollop wrist seal lube
  • Bees Wax
  • Zip Slip

an O’Three “Off the peg – Made to fit“ Drysuit here…

To help O’Three ascertain whether
you are an “Off the Peg – Made to Fit” size
and the type of adjustments that might be required,
please fill in our quick online measurement form.

Customising your Port10

These options are available at additional cost.
Cargo 25
  • Dimensions 22cm x 16cm x 7cm (Approx 2.5L)
  • HD Velcro Closure
  • Compact when empty
  • Hidden Slate Pocket
  • 2x D-Rings
  • Self Draining
Cargo 30
  • Dimensions – 24cm x 18cm x 7cm (Approx 3L)
  • HD Velcro Closure
  • Compact when Empty
  • Hidden slate pocket
  • 2x D-Rings
  • Self Draining
  • Dimensions – 28cm x 18cm x 6cm (Approx 3L)
  • 32cm Double opening Zip
  • Compact when Empty
  • Hidden slate pocket
  • 2x D-Rings
  • Self Draining
  • Dimensions – 24cm x 18cm x 2cm
  • HD Velcro Closure
  • Low Profile
  • D-Ring
  • Self Draining
HD Boot
  • Super warm contoured foot.
  • Strengthened sole combining an ergonomically reinforced upper and heel.
  • Built in fin stop.
Pivot Boot
  • A 3.5mm high density boot.
  • Contoured foot and reinforced sole.
  • Ergonomically shaped with strap down ankles.
  • Built in fin stop.
Soft Sock

2.5mm Ri material. A soft sock option may be a solution for some, but please be aware; this system can create other issues.

If you would prefer this option on your off the peg suit, it will add an additional small cost.

Please call for more details – +44 (01305) 822820

Low Profile Swivel Suit Inflation Unit and Hose

Apeks robust and totally reliable inflation valve features an extra large recessed push-button allowing easy operation.

The smooth back plate gives protection from uncomfortable pressure loads and helps prevent cold air blasts through underclothing.

The valve sits low on the chest making it less prone to snagging.

The 360° rotation is a key feature of this valve to meet your personal hose configuration.

Comes complete with a 29″ (74cm) long medium pressure hose, with the more universal Seatec coupling.

Low Profile Automatic Dump Valve

The most technically advanced and reliable automatic dump valve available.

Correctly adjusted, the valve gives effortless yet controlled hands free ascent as expanding air automatically vents from your dry suit.

Equipped with a manual over-ride system allowing you to vent the suit completely without disturbing your personal buoyancy setting.

This valve has the lowest profile with optimum dump rate.

It has an improved ratchet feel and is ergonomically designed for ease of use

Original Automatic Dump Valve

Functions in exactly the same way as the Low Profile version.

For Re-breather users, with front mounted counter lungs, this valve will be easier to reach.

This valve can be supplied with a higher break pressure approximately twice that of the original, this higher break valve adds an additional small charge.

Carbon Braided Hose

This high end hose features an external nylon safety braiding designed to resist the snags and abrasions that divers can often encounter.

The double braiding also resists UV rays out of the water, thus extending the lifespan of the hose.

Can be supplied with either Seatec or std Apeks coupling.

This hose comes as standard on the ccn range, for other suits there will be a small charge.

Allowing you to answer the call of nature without having to remove your suit above and below the water.

Female friendly when used in conjunction with the ‘SheWee Go’

Allowing you to answer the call of nature without having to remove your suit above and below the water.

Female friendly when used in conjunction with the ‘SheWee Go’

We have been working with manufacturers of Dry Glove systems and particularly Kubi so that they work perfectly with our neoprene wrist seals.

Due to various dry glove systems available and ways of fitting them to our suits please contact one of the team discuss the options –
+44 (0)1305 822820.

As with a front entry dry suit a hood attached system will tick some boxes, but will create one or two negatives.

Increased warmth and reduced flushing are the real benefits, however equalisation and neck seal setting is made harder.

Removal of the hood is obviously not an option when the weather improves.

There are several options available and you may have a preference, please call and we will be very happy to discuss those options in more detail –
+44 (0) 1305 822820

Although made to measure is the ultimate way to have a suit made, at certain times of the year long lead times have to be considered. If you need a quicker completion, please consider the “off the peg – made to fit” options that are available on all O’Three suits.

The three key stages to O’Three’s customisation Made to Measure process. There are many factors that need to be considered when purchasing a made to measure dry suit. However, certain build parameters must always be adhered to.

Types of diving and individuals perception of just how a suit should fit can vary hugely. O’Three will always guide and advise on how we feel a suit should be tailored and customised, but ultimately, it is down to each person.

To ensure this 100% customisation is achieved, we always insist, where possible a fitting is done before your suit is complete. It is at this stage any adjustments that need to be made to the fit of your suit can simply and easily be done with no compromise to the integrity of any seam. Exact position of all components, valves, pockets etc are then discussed and marked onto your suit.

This might seem like a long winded way but it works. We feel this is the only way you can truly achieve a genuinely customised suit.

Stage 1: Choose Your Suit.

Either online, over the phone or in the shop. Get measured, decide on materials, seal combinations and colour ways at this first step.

If you choose to do any of the above remotely O’Three will always be pleased to guide you through this process. It’s not really that difficult as long as you remember some basic points as detailed in the measurement form section of this website. Please call if not 100% sure

Stage 2: The Fitting

This is the most important and critical stage of production. We know it’s a big ask, but it is at this stage, where every effort must be made to try and come down to our workshops here in beautiful Portland, Dorset, UK. We call this “a fitting”. This fitting date is given when you place your order.

Stage 3: Completion

After stage two, you will be given a completion date for collection or despatch of your new suit. Normally two working weeks after your fitting.

As well as the full specification above, the cost of your suit includes many customising options, some of which are listed below.

A choice of:

Material Combinations
Customised Tailoring
Knee Pads
Shoulder Pads
Valve Options
Hose Options
Two Pockets
Braces (if required)
Boot / Soft Sock
Zip Weight
Zip Guard
Other options are available at additional cost.

High Profile Auto, break pressure x2
Commercial reinforcements
Additional valves
Extra Pockets
Hood Attached
Dry Glove Systems

“Off the Peg – Made to Fit” Service

Taking into account our “Off the Peg – Made to Fit” service, our standard size chart should be used as a guide.

Although “Off the Peg”, O’Three will ensure that a good fit is achieved. Our extensive size range and the large amount of adjustments that can be made, for example, tweaks to the seals, arms and legs that might need shortening, or a change in boot size, means that we can correctly fit many shapes and sizes into “off the peg” suits…., we have been doing this for many years and we have called this process, “Off the Peg – Made to Fit”.

The MF5 Drysuit used in conjunction with O’Three’s PBB base layer makes it possible for O’Three to produce a suit that will fit you well throughout the entire year.

Seal alterations are free of charge.

To help O’Three ascertain whether you are an “Off the Peg – Made to Fit” size and the type of adjustments that might be required, please fill in our quick online measurement form.

Size Guide

Mens Sizes

Womens Sizes

PLEASE NOTE: Ultimately, it is you the wearer of the dry suit that is generating the heat, the suit you choose to wear (as long as it is a neoprene suit) is simply the insulator. A membrane style of suit will offer virtually no thermal protection.

The thermal guidance information above is purely that, a guide.  If you are a petite lady and feels the cold when snuggled up in bed with a winter duvet on all year round, or you are a guy that wears a T-Shirt in the depths of winter your reliance on a neoprene dry suit from a thermal perspective is at either end of the scale.

Remember, if your base layer / under suit combination is coming up short at certain times of the year, just add flexible layers using the correct fabrics to improve your resistance to the cold. Think climbers and skiers. Get it wrong and you will increase bulk and buoyancy.

Please be sensible realistic and careful when choosing the appropriate thermal protection. We are all different.

Your life could depend on it.

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