Fourth Element HALO A°R Men's Drysuit Undergarment
By Fourth Element | Space-Age A°RGON™ Thermal Matrix | Bodymapped Cold-Water Defense
Engineered with technology originally developed for space exploration and cryogenics, the Fourth Element HALO A°R Men's Drysuit Undergarment delivers unprecedented thermal defense for cold-water divers. Utilizing the extreme insulation material A°RGON™ enclosed within a compression-resistant matrix, the HALO A°R achieves phenomenal warmth from a remarkably thin, low-bulk, and low-buoyancy garment.
Building on Fourth Element’s deep expertise in bodymapping, thermal imaging was used to refine heat protection along key torso regions. An offset chest zipper and thermal baffles minimize torso heat loss while in horizontal trim. Wrapped in a wind and water-repellent stretch outer layer with thumb loops and foot stirrups, the HALO A°R guarantees all-day comfort during extended Pacific Northwest technical and recreational dives.
A°RGON™ Insulation Matrix & Horizontal Trim Optimization
A°RGON™ is an ultralight insulation matrix that resists gas compression under drysuit pressure. By placing heavy thermal defense from shoulders to knees while maintaining flexible joint zones, you get maximum cold-water insulation without needing excessive weight belt ballast or sacrificing underwater agility.
Key Performance Features
- A°RGON™ Extreme Thermal Insulation: Aerogel-inspired technology delivers maximum thermal resistance with minimal thickness and buoyancy.
- Bodymapped Thermal Protection: Concentrates enhanced insulation from shoulders to knees for targeted core warmth where cold water impacts divers most.
- Optimized for Horizontal Trim: Offset chest zipper and internal baffles prevent cold air migration across the torso when swimming horizontally.
- Wind & Water-Repellent Outer Layer: All-way stretch shell protects against surface weather on boat decks and minor drysuit leaks.
- P-Valve & Convenience Ready: Features a smooth two-way fly zipper for simple P-valve hose routing plus a secure zippered stash pocket.
- Base Layer System Integration: Designed for total comfort over base layers like the Fourth Element J2 or Xerotherm.
- Easy Maintenance: Fully machine washable for hassle-free post-dive care.
Fourth Element Men's Undergarment Size Chart
| Size | Chest | Waist | Hips | Height |
|---|---|---|---|---|
| Small (S) | 35" – 38" (89–97 cm) | 29" – 31" (74–79 cm) | 35" – 38" (89–97 cm) | 5'6" – 5'8" (168–173 cm) |
| Medium (M) | 38" – 41" (97–104 cm) | 31" – 34" (79–86 cm) | 38" – 41" (97–104 cm) | 5'8" – 5'11" (173–180 cm) |
| Large (L) | 41" – 44" (104–112 cm) | 34" – 37" (86–94 cm) | 41" – 44" (104–112 cm) | 5'11" – 6'2" (180–188 cm) |
| X-Large (XL) | 44" – 47" (112–119 cm) | 37" – 40" (94–102 cm) | 44" – 47" (112–119 cm) | 6'1" – 6'4" (185–193 cm) |
| 2X-Large (2XL) | 47" – 50" (119–127 cm) | 40" – 44" (102–112 cm) | 47" – 50" (119–127 cm) | 6'2" – 6'5" (188–196 cm) |
Sizing & Short/Long Fit Tip: Measure yourself wearing your primary drysuit base layer (such as Fourth Element J2 or Xerotherm). Fourth Element undergarments are tailored for a snug, athletic trim. View our detailed Fourth Element Men's Size Chart Guide for full measurement instructions.
Technical Specifications
| Brand / Model | Fourth Element / HALO A°R Men's |
| Insulation Technology | A°RGON™ Aerogel-inspired Compression-Resistant Matrix |
| Outer Shell | Windproof, Water-Repellent All-Way Stretch Fabric |
| Zipper & Hardware | Offset Torso Zipper with Thermal Flap | Two-Way Fly Zipper |
| Ancillary Features | Low-Profile Thumb Loops, Elastic Foot Stirrups, Zippered Arm Pocket |
| Care Instructions | Machine Washable (Gentle Cycle, Hang Dry) |
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