Heavyweight Merino Thermal Bottoms: Maximum Insulation for Extreme Cold Hunts

When temperatures plunge and the hunt demands serious insulation, the Heavyweight Merino Thermal Bottoms deliver uncompromising warmth without unnecessary bulk. Built from ultra-premium 335 gsm merino wool blend fleece, these bottoms are engineered as the foundation of your late-season layering system.

The high-density fleece construction traps heat efficiently while remaining breathable enough to prevent moisture buildup during movement. A soft brushed interior eliminates itch and enhances next-to-skin comfort, while natural merino performance manages moisture and resists odor during extended wear. Designed to layer seamlessly under waders, bibs, and outerwear, these bottoms provide dependable insulation for long sits in sub-freezing conditions.

This is the warmest base layer in the Dive Bomb lineup—purpose-built for deep winter performance.

Key Features

• 335 gsm heavyweight merino wool blend fleece for maximum insulation
• 49% merino wool for natural odor resistance and moisture control
• Soft brushed interior for premium next-to-skin comfort
• High-density fleece construction for deep cold protection
• Stretch-infused knit for mobility without bulk
• Functional fly for convenience in the field
• Ultra-thin stirrups to keep pant legs securely in place

Built for Deep Winter Layering

Designed as a true next-to-skin base layer, the Heavyweight Merino Thermal Bottoms anchor your cold-weather system when lighter layers are no longer enough. They retain heat during extended stationary sits while remaining breathable during active movement, keeping your lower half insulated without overheating.

Premium Cold-Weather Performance

As the heaviest offering in the Dive Bomb thermal lineup, these bottoms rival top-tier cold-weather systems with refined wool performance and durable construction. From frozen ground to wind-driven late-season fronts, they provide the insulation serious hunters rely on when conditions turn extreme.