XEROTHERM

THE ULTIMATE THERMAL BASELAYER

The fastest wicking thermal baselayer on the market, tried and tested in some of the most extreme environments on the planet. The xerotherm is specified by the FBI and many other professional dive teams.

 

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The ultimate baselayer for use under a drysuit. Made using Polartec® Powerstretch® originally developed for NASA, the Xerotherm traps a layer of air – a much better insulator than water – next to the skin, keeping the wearer drier and more comfortable. The range is designed to be worn under another undersuit or on its own under a neoprene drysuit.

The knit of the Xerotherm fabric produces the fastest wicking effect of any of the products in the fourth element product range. Moisture is drawn out through the fabric along fine fibres and then spreads out over the outer surface. This maintains a thin layer of air next to the skin. This is so effective in the Xerotherm that some wearers report experiencing minor suit leaks during the dive without even noticing until after the dive.

“The performance is superb”. This was the reaction of Doug Allan, world renowned and award-winning underwater filmmaker and author after testing the Xerotherm in -2 degree (29F) water inside the Arctic Circle in Svalbard, whilst shooting sequences for the BBC production The Blue Planet.

The Xerotherm represents the ultimate in baselayer performance, unrivalled by anything else on the market. Since Doug’s testing, the Xerotherm has been to the top of Everest and down to the Titanic, as well as being specified by the FBI Dive Teams, Norwegian Navy and British Police Diving Unit.

Outstanding thermal performance

Lightweight low bulk and buoyancy

Extremely fast wicking

Hardwearing

Machine washable

Performs when wet

53% Polyester / 38% Nylon / 9% Elastane

Machine wash cold. We recommend using Sub30 Technical Garment Wash, fourth element’s environmentally friendly washing solution for technical fabrics. Line dry, do not tumble dry.

Please refer to the size charts at the bottom of this page for a more comprehensive guide.

3 PIECE SET & VEST

  • XS
  • S
  • M
  • L
  • XL
  • XXL

TOP & LEGGINGS

  • XS
  • S
  • M
  • L
  • XL
  • XXL
  • XXXL

BEANIE HAT

  • One Size

SOCKS

  • XS
  • S
  • M
  • L
  • XL
  • XXL

PRODUCTS IN THE RANGE

Xerotherm Long Sleeve Top

UNISEX

With flat seams and a long body to ensure that no separation between top and leggings develops, the top is the ideal next-to-skin layer under a drysuit. Thumb loops keep the sleeves in place whilst donning the drysuit and should be removed from the thumb and pushed back through the wrist seals prior to diving.

 

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Xerotherm Vest

UNISEX

The perfect addition to a diver’s thermal protection, the vest enhances the warmth of the body core without significantly affecting bulk or buoyancy. Freedom of movement of the arms is also maximised, thanks to the sleeveless design

 

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Xerotherm Leggings

UNISEX

These simple, minimalist leggings have been designed for maximum performance. The high waistband ensures good overlap of the top and leggings and unique foot pocket design ensures the leggings do not ride up. Flat seams provide next-to-skin comfort throughout the dive.

 

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xerotherm hat

Xerotherm Beanie Hat

This is the perfect complement to the rest of the Xerotherm range. Effective wet or dry, the beanie hat is the ideal thing to stash in a dive bag, or even the pocket of a BCD to put on to warm up after a dive.

 

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Xerotherm Socks

Excellent thermal protection and comfort. Thin enough to be worn under other drysuit socks yet capable enough as thermal protection in their own right, they are comfortable thanks to the flat locked seams and fast wicking fabric.

 

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SIZE CHARTS

Use the table below as a guide to help select which size Xerotherm baselayer best suits your body type.
If you require any further assistance/advice please don’t hesitate to contact us.

For Xerotherm Socks and Wrist Warmer sizes please refer to Socks and Gloves pages.

The Xerotherm Hat is available in one size.

Mens Size Chart

SizesHeight Chest Waist Inside Leg* 
InchesCmInchesCmInchesCmInchesCm
XS Short5'3"-5'6"161-16930-34"76-8623-27"58-6828.5-30.5"73-77
XS5'5"-5'8"165-172.530-34"76-8623-27"58-6830-31.5"76-80
S Short5'5"-5'8"165-172.534-38"86-9627-30.5"68-7830-31.5"76-80
S5'7"-5'10"170-17834-38"86-9627-30.5"68-7831-32.5"79-83
S Tall5'9"-6'0"175.5-18334-38"86-9627-30.5"68-7832.5-34"82-86
M Short5'7"-5'10"170-17838-41.5"96-10630.5-34.5"78-8831-32.5"79-83
M5'9"-6'0"175.5-18338-41.5"96-10630.5-34.5"78-8832.5-34"82-86
M Tall5'11"-6'2"180.5-18838-41.5"96-10630.5-34.5"78-8833.5-35"85-89
L Short5'9"-6'0"175.5-18341.5-45.5"106-11634.5-38.5"88-9832.5-34"82-86
L5'11"-6'2"180.5-18841.5-45.5"106-11634.5-38.5"88-9833.5-35"85-89
L Tall6'1"-6'4"185.5-19341.5-45.5"106-11634.5-38.5"88-9834.5-36"88-92
XL Short5'11"-6'2"180.5-18845.5-49.5"116-12638.5-42.5"98-10833.5-35"85-89
XL6'1"-6'4"185.5-19345.5-49.5"116-12638.5-42.5"98-10834.5-36"88-92
XL Tall6'3"-6'6"190.5-19845.5-49.5"116-12638.5-42.5"98-10836-37.5"91-95
XXL Short6'1"-6'4"185.5-19349.5-53.5"126-13642.5-46.5"108-11834.5-36"88-92
XXL6'3"-6'6"190.5-19849.5-53.5"126-13642.5-46.5"108-11836-37.5"91-95
XXXL Short6'3"-6'6"190.5-19853.5-57.5"136-14646.5-50.5"118-12836-37.5"91-95
XXXL6'5"-6'8"195.5-20353.5-57.5"136-14646.5-50.5"118-12837-38.5"94-98

Womens Size Chart

Sizes UKSizes USAHeight Chest Waist Hips Inside Leg* 
InchesCmInchesCmInchesCmInchesCmInchesCm
6 X Short4 X Short5'1"-5'4"155-162.527-30"68-7620-23"51-5930-33"76-8426.5-28"67-71
6 Short4 Short5'2"-5'5"157.5-165.527-30"68-7620-23"51-5930-33"76-8427-28.5"69-73
645'3"-5'6"160-16827-30"68-7620-23"51-5930-33"76-8428-29.5"71-75
8 X Short6 X Short5'2"-5'5"157.5-165.529 -32.5"74-8222.5-25.5"57-6532.5-35.5"82-9027-28.5"70-75
8 Short6 Short5'3"-5'6"160-16829 -32.5"74-8222.5-25.5"57-6532.5-35.5"82-9028-29.5"71-75
865'4"-5'7"162.5-17029 -32.5"74-8222.5-25.5"57-6532.5-35.5"82-9028.5-30.5"73-77
10 X Short8 X Short5'3"-5'6"160-16831.5-34.5"80-8825-28"63-7134.5-38"88-9628-29.5"71-75
10 Short8 Short5'4"-5'7"162.5-17031.5-34.5"80-8825-28"63-7134.5-38"88-9628.5-30.5"73-77
1085'5"-5'8"165-17331.5-34.5"80-8825-28"63-7134.5-38"88-9629.5-31"75-79
12 Short10 Short5'5"-5'8"165-17334-37"86-9427-30.5"69-7737-40"94-10229.5-31"75-79
12105'6"-5'9"167.5-17534-37"86-9427-30.5"69-7737-40"94-10230.5-32"77-81
12/14
(12 top/
14 bottom)
10/12
(10 top/
12 bottom)
5'6"-5'9"167.5-17534-37"86-9429.5-32.5"75-8339.5-42.5"100-10830.5-32"77-81
14 Short12 Short5'6"-5'9"167.5-17536-39.5"92-10029.5-32.5"75-8339.5-42.5"100-10830.5-32"77-81
14125''7"-5'10"170-17836-39.5"92-10029.5-32.5"75-8339.5-42.5"100-10831-32.5"79-83
16 Short14 Short5''7"-5'10"170-17838.5-41.5"98-10632-35"81-8941.5-45"106-11431-32.5"79-83
16145'8"-5'11"172.5-18038.5-41.5"98-10632-35"81-8941.5-45"106-11432-33.5"81-85
18 Short16 Short5''7"-5'10"170-17841-44"104 -11234.5-37.5"87-9544-47"112-12031-32.5"79-83
18165'8"-5'11"172.5-18041-44"104 -11234.5-37.5"87-9544-47"112-12032-33.5"81-85
20 Short18 Short5''7"-5'10"170-17843.5-46.5"110-11836.5-40"93-10146.5-49.5"118-12631-32.5"79-83
20185'8"-5'11"172.5-18043.5-46.5"110-11836.5-40"93-10146.5-49.5"118-12632-33.5"81-85

Hat Size Chart


Hat SizesHead Circumference
Cm
M53 - 59
L56 - 61
XL59 - 64

Socks Size Chart

Unisex SizesUKUSEU
XS3-44-535-37
S5-66-738-40
M7-88-941-42
L9-1010-1143-44.5
XL11-1212-1346-47
XXL13-414 - 1548-49

Comparison Size Chart

UKUSAFranceGermanyItaly
64343238
86363440
108383642
1210403844
1412424046
1614444248
1816464450
2018484652

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