Best Freediving Wetsuit in 2025 - Open-Cell, Thickness & Fit Guide
Our Verdict
Open-cell neoprene is the right choice for any freediver who dives regularly and wants proper insulation. It clings to skin directly and insulates more efficiently than closed-cell or lined alternatives. For beginners not yet sure they want to commit, a quality closed-cell suit works fine in warmer water. Thickness should be matched to water temperature - not guessed.
Freediving wetsuits are not scuba suits and not surf suits. They’re thinner, stretchier, and built around a specific principle: a suit that insulates with minimum restriction to breathing depth and chest expansion.
Getting this right makes a significant difference to comfort, bottom time, and how much energy you burn staying warm.
Open-Cell vs Closed-Cell
The most important decision in a freediving wetsuit is the interior construction.
Open-cell neoprene has a raw, unlined interior. When you put it on, the cellular neoprene clings directly to your skin, trapping a thin water layer that heats to body temperature. The contact is direct and insulation is efficient - open-cell suits keep you warmer at a given thickness than equivalent closed-cell alternatives.
Closed-cell neoprene has a fabric lining or smooth-skin interior. It’s easier to put on, more resistant to tearing, and less delicate. In warm tropical water (25C+) the insulation difference matters less and the durability advantage is real. For anything below 22-24C, open-cell is noticeably warmer.
Almost all experienced freedivers use open-cell suits. The learning curve of putting one on (lubricant required, pull slowly) is a minor inconvenience offset by meaningfully better warmth.
Thickness Guide
Matching thickness to temperature:
| Water Temp | Recommended Thickness |
|---|---|
| Above 26C (79F) | 1.5-2mm or no suit |
| 22-26C (72-79F) | 3mm |
| 18-22C (64-72F) | 5mm |
| 14-18C (57-64F) | 7mm |
| Below 14C (57F) | 7mm + hood + gloves |
These are guidelines. Cold tolerance varies. If you run cold, move one thickness category warmer.
Cut and Construction
Freediving suits are cut specifically for the sport. The chest and arm areas are wider and more flexible than spearfishing suits, because full chest expansion on the pre-dive breath is critical. A suit that restricts your inhale reduces your effective lung capacity before you even enter the water.
Two-piece designs - pants and jacket - provide double insulation at the core where it matters most. The jacket overlap at the waist is where open-cell suits seal best.
Putting on an Open-Cell Suit
The first time, this takes ten minutes. With practice, about two.
Mix a small amount of hair conditioner with water in a bucket or spray bottle. Apply generously to the inside of the suit. Pull the pants on one leg at a time, smoothing the neoprene upward as you go. Same for the jacket. Never grab and pull sharply - open-cell neoprene tears. Slow, steady pressure works.
Our Picks
Full cards above. In summary:
- Regular diver in temperate water: SEAC Camo 5mm. Good build, fair price, proper open-cell.
- Depth-focused freediving: Cressi Apnea 5mm. Cut optimized for vertical diving.
- Wants to buy once and keep it: Beuchat Mundial. Higher cost, better long-term quality.
- Warm water, first suit, low commitment: IST 3mm closed-cell. Acceptable for 25C+ water.
Related: Wetsuit Thickness Guide - Freediving Wetsuits Hub
Our Top Picks
Best Overall - Open-Cell for Temperate Water
SEAC Camo 5mm Open-Cell Wetsuit
SEAC
~$200
- Thickness
- 5mm
- Interior
- Open-cell neoprene
- Exterior
- Supratex
- Water temp
- 16-22C / 61-72F
The SEAC Camo suits are purpose-built for spearfishing and freediving with open-cell interiors. The 5mm thickness handles water in the 16-22C range comfortably. Supratex exterior is more durable than bare neoprene while remaining flexible. Good value for a proper open-cell suit.
- Open-cell interior for proper insulation
- Supratex exterior resists abrasion better than bare neoprene
- Flexible - doesn't restrict breathing or arm movement
- Available in two-piece design for easier dressing
- Open-cell requires lubricant (water or conditioner) to put on
- More delicate than closed-cell - avoid sharp surfaces
- Camo pattern not to everyone's taste
Affiliate link - no extra cost to you
Best Open-Cell for Pure Freediving (No Spear)
Cressi Apnea 5mm Wetsuit
Cressi
~$180
- Thickness
- 5mm
- Interior
- Open-cell
- Cut
- Freediving specific
- Water temp
- 16-22C / 61-72F
Cressi's Apnea line is designed specifically for freediving rather than spearfishing crossover. The open-cell interior is very smooth and seals well against skin. Movement is excellent - arm reach and chest expansion are unrestricted. A strong choice for divers focused on vertical depth work.
- Excellent flexibility for depth diving
- Good open-cell insulation
- Specific freediving cut - wider chest area
- Cressi quality control is consistent
- Plain finish scuffs more easily than Supratex exteriors
- Limited camo/color options
Affiliate link - no extra cost to you
Best Build Quality - Long-Term Investment
Beuchat Mundial Competition 5mm
Beuchat
~$250
- Thickness
- 5mm
- Interior
- Open-cell
- Brand origin
- France
- Water temp
- 16-22C / 61-72F
Beuchat has been making open-cell suits for spearfishing and freediving for decades. The Mundial Competition uses high-quality neoprene with good cell structure that maintains flexibility after extended use. More expensive than SEAC or Cressi, but the build quality justifies it for divers who will use the suit extensively.
- High-quality neoprene - cell structure holds up over time
- Excellent insulation
- Proven brand with long track record
- Good seam construction
- Higher price than comparable alternatives
- Availability can be limited outside Europe
Affiliate link - no extra cost to you
Best Budget - Warm Water / First Suit
IST 3mm Closed-Cell Wetsuit
IST Sports
~$80
- Thickness
- 3mm
- Interior
- Closed-cell / smooth skin
- Water temp
- 22-28C / 72-82F
- Best for
- Tropical recreational diving
A closed-cell suit is a reasonable starting point for divers in warm water (25C+) who aren't sure how much they want to invest yet. IST produces competent entry-level suits at accessible prices. The insulation is not as efficient as open-cell and the suit is stiffer, but it works for tropical recreational diving.
- Low price
- Easier to put on than open-cell
- More durable - less damage-prone than open-cell
- Suitable for very warm water
- Less insulation efficiency than open-cell
- Stiffer - restricts breathing more than open-cell
- Not appropriate for water below ~22C
Affiliate link - no extra cost to you
Frequently Asked Questions
What is the difference between open-cell and closed-cell freediving wetsuits?
How do I put on an open-cell wetsuit?
What wetsuit thickness do I need?
One piece or two piece wetsuit for freediving?
How long does a freediving wetsuit last?
Marcus Webb
Freediving Instructor & Gear Reviewer
Marcus Webb has been freediving for over nine years, training in Dahab, the Philippines, and along the California coast. He holds a PADI Advanced Freediver certification and AIDA 2* and has completed over 1,200 logged dives across static apnea, dynamic, and depth disciplines. He reviews every piece of gear he recommends from personal use — he does not accept payment for positive coverage.