Fourth Element Xerotherm Set Review
A premium base layer for drysuit diving in moderate temperatures. Lightweight, streamlined, and surprisingly warm for its thickness, but the price is hard to ignore.
By Tyler Allison
· Updated July 2025
- Current role
- Lighter drysuit layer, alone or under the Arctic
- Still in my kit
- Yes
The Short Version
The Xerotherm gives me a lighter drysuit layer for dives in the low 60s°F and for Chicago summer quarry days when the Arctic feels excessive. It also layers under the Arctic for colder dives. I like the fit and comfort, but I am not convinced its price makes sense without that layering role.
Would I buy it again? Probably, but only to stay within the Fourth Element ecosystem.
What Works
- Excellent base layer for low 60s °F dives
- Smooth fit under drysuit seals
- Layers easily with Arctic for cold water dives
- Comfortable and breathable even on hot days
What Doesn't
- Expensive for what it is
- Less warmth than other options at same price point
- Hard to justify if not layering or brand-matching
Why I Chose the Xerotherm
I already owned the Fourth Element Arctic and found it too hot during Chicago’s summer quarry season. I wanted something lighter and more breathable for dives in the low 60s. The Xerotherm filled that role well. I also liked that I could layer it under the Arctic if I wanted to dive into much colder water like Lake Michigan later in the season.
Since I was already using the Arctic, staying within the Fourth Element line made sense. But to be honest, I’m not convinced the Xerotherm delivers enough value to justify the price if you’re not committed to brand consistency. It works, and I like it, but I’m not sure it’s essential.
Who It Makes Sense For
This item is best suited for:
- Drysuit divers in low 60s°F water needing a breathable base layer
- Divers who want to layer with the Arctic for colder dives
- Fourth Element fans seeking consistent gear system
It may not be ideal for:
- Divers wanting maximum insulation per dollar
- Warm-water divers without layering needs
What It Is Like to Dive
- Temperature Range
- Works well on its own in the low 60s Fahrenheit. Below that, I switch to the Arctic or add layers.
- Fit & Flexibility
- No bulk issues. It wears close to the body and doesn't interfere with seals or drysuit movement.
- Layering
- Designed to work under other undergarments like the Arctic. Comfortable and breathable even in warm weather.
- Comfort
- No itch, no odor issues, no bunching or pressure spots after repeated dives.
Ownership and Value
Repeated use and washing have not produced sagging or visible wear, and the close fit does not interfere with drysuit seals or valves. On its own, I need another layer below the low 60s°F. It is well made, but the limited standalone warmth is why I remain cautious about its value.