Merrell Coldpack 3 Thermo Mid Waterproof Boot
- 200 grams synthetic insulation
- SOLARCORE Aerogel insole
- Waterproof full grain leather and mesh upper
- Waterproof membrane
- Air Cushion in the heel
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An insulated waterproof mid boot for cold, wet winter walks and light snow hikes. The listing gives no temperature limit or outsole details.
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ASIN: B0BMJH7GKGCategory: Hiking Boots
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Overview
An ultra-thin SOLARCORE Aerogel insole blocks cold from below while low-bulk synthetic insulation warms the upper in the Merrell Coldpack. A waterproof membrane and leather keep slush out.
Warmth without bulk makes it comfortable for winter errands and snowy trails. No temperature limit or outsole spec is listed, so extreme cold use is a guess.
Who it's for
Winter commuting, dog walks and snowy day hikes suit an insulated waterproof mid. Ice fishers and outdoor workers in extreme cold need a pac boot with a temperature limit.
Pros and cons
- Thin Aerogel insole blocks ground cold
- Waterproof leather and membrane
- Temperature limit not listed
- Outsole compound not described
- Insulation moderate for extreme cold
Performance notes
Underfoot warmth comes from the Aerogel insole slowing heat loss into frozen ground, while the synthetic fill traps warm air around the foot. The membrane lets sweat escape so insulation stays dry.
Specifications
| Brand | Merrell |
|---|---|
| Dimensions & fit | |
| Shoe Height Map | Mid |
| Construction & materials | |
| Outer Material | Full grain leather and mesh |
| Insole Material | SOLARCORE Aerogel |
| Other details | |
| Water Resistance Level | Waterproof, membrane |
| Insole Cushioning | Merrell Air Cushion heel |
| Seasons | Winter |
| Insulation | 200 grams synthetic |
Frequently asked questions
How warm is the Merrell Coldpack 3 Thermo Mid?
It has 200 grams of synthetic insulation and a SOLARCORE Aerogel insole. No temperature limit is listed.
Is the Coldpack 3 Thermo Mid waterproof?
Yes. It has a waterproof leather and mesh upper with a waterproof membrane.
Is the Coldpack 3 bulky?
The listing describes the insulation as lightweight and low bulk, with an ultra-thin insole.