Merrell Thermo Glacier Mid Waterproof notable features

-Featuring grippy Vibram outsoles, M Select DRY waterproof membrane, and Primaloft Aerogel insulation, these winter boots from Merrell are greatly suitable for snowy conditions and freezing temps.

-It comes with compression-molded EVA midsole for stability and comfort.

Size and fit

The Thermo Glacier Mid is a hiking boot designed for both men and women. It has a full-grain leather upper that conforms to the shape of the foot after some breaking in. The Kinetic Fit BASE insole and the traditional lace-up closure also helps the wearer achieve a snug and custom fit.


The shoe outsole features the Arctic Grip by Vibram, which is the latest sole technology yet for winter hiking boots. It utilizes an advanced cold-weather gripping system specifically engineered and designed for wet ice. 

Wet ice is the biggest challenge that winter hikers encounter because it’s very slick. Without enough foot traction, you can slip, fall, and suffer from a serious injury. The Thermo Glacier Mid WP outsole is equipped with 5mm lugs for maximum traction. This makes the boot suitable not just on wet ice but also on dry ice.

According to Vibram, the Arctic Grip has “up to three times better grip” on snowy surfaces than other Vibram soles.


This winter hiker from Merrel features a compression-molded EVA midsole (CMEVA). In this method, a block of EVA is inserted into a mold. As heat and pressure are applied, the material expands and fills in the shape of the mold.

While there is a newer approach to producing midsoles called “EVA injection”, compression remains popular because it creates a better design detail. The traditional process also results in firmer midsoles, which are more preferred in hiking shoes.

Additionally, the Thermo Glacier Mid WP features a heat-reflective midsole that works by radiating body heat toward the foot.


For the upper, this boot makes use of full-grain leather. This specific type of leather is also used in other premium boots and hiking footwear because it’s naturally durable, water-resistant, and has the ability to conform to the shape of the foot.

The Thermo Glacier Mid WP is lined with M Select DRY impermeable membrane to keep water and moisture from entering the boot. Plus, it is equipped with 1.5mm Primaloft Aerogel over-the-toe insulation, along with Conductor fleece lining for warmth.

Completing the upper are the molded nylon arch shank, protective rubber toe cap, red laces, and bellows tongue.


The current trend of Merrell Thermo Glacier Mid Waterproof.
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Paul Ronto
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Over the past 20 years, Paul has climbed, hiked, and ran all over the world. He has summited peaks throughout the Americas, trekked through Africa, and tested his endurance in 24-hour trail races as well as 6 marathons. On average, he runs 30-50 miles a week in the foothills of Northern Colorado. His research is regularly cited in The New York Times, Washington Post, National Geographic, etc. On top of this, Paul is leading the running shoe lab where he cuts shoes apart and analyses every detail of the shoes that you might buy.