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Out of stock - Mammut Mercury III Mid GTX® Men's Hiking Boot

Out of stock

Lightweight hiking boots with a modern look, letting you hit the trail in confidence.

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Product code: 15897940 / 055435

Lightweight hiking boots with a modern look, letting you hit the trail in confidence.

GORE-TEX® TechnologiesPart of their light hiking range, Mammut's Mercury Mid III GTX® Hiking Boot provides great all-round protection in changeable weather conditions.

They have a durable and stable upper which is constructed from a blend of terracare® nubuck leather* and softshell fabrics, built around a waterproof and breathable GOTE-TEX® membrane.

360 Memo Foam in the lining and footbed moulds to the shape of your foot and helps keeps you comfortable, while the smooth-running Polyamide (PA) webbing laces ensure they are easy to put on and take off.

The board lasted vibram® Frog Grip outsole has been designed with hexagonal studs to ensure excellent grip, working alongside their patented Rolling Concept® sole to encourage a natural rolling movement and reduce fatigue.

  • Liquid Rubber reinforcments protect against abrasion and damage
  • Board lasting 
  • Last index: Hiking
  • Flex index: A5
  • Weight (UK 8.5): 540g

*Sustainably produced in Germany, terracare® leather is made with minimal use of water, electricity from renewable energy sources and state-of-the-art production methods.
Standard Lace Up
Waterproof, Breathable, GORE-TEX, Memory Foam, Toe Protection, Vibram
Mid Cut
3D memo foam
EVA wedge
Expedition, Hiking, Trekking, Walking, Backpacking, Duke of Edinburgh's Award Expeditions
Vibram Frog Grip
Mid-stiffness: for backpacking and trekking
Nubuck Leather, Velours Leather and Soft Shell

This product qualifies for the following delivery methods

Standard Delivery (7-10 Days) (FREE)


Once despatched you will receive updates from the courier.

Premium Express Delivery (2 working days) (£6.95)


Premium Express delivery takes 2 working days, order by 4pm. Once despatched you will receive updates from the courier.

Reserve and Collect (within an hour) (FREE)


We will notify you when your order is ready to collect.

Click and Collect (7-10 Days) (FREE)


You will be notified when your order is ready to collect.

AM Delivery (£7.95)


Order by 8pm and get your item delivered to you by 12pm the next working day (Not available for NI, Channel Islands or Highlands)

Bike Delivery (£4.95)


Bike delivery is £4.95. This applies to all bikes, and these orders are upgraded to a DHL courier service.

British Forces Post Office (BFPO) (FREE)


Forces ONLY and cannot be used for civilian or business deliveries

Delivery before 10:30am (£8.95)


Order by 8pm and get your item delivered to you by 10:30am the next working day (Not available for NI, Channel Islands or Highlands) Excludes Bank Holidays.

Saturday Delivery (order by 6pm Friday) (£5.95)


Next Day Delivery (order by 6pm Mon - Fri) (£2.95)


Delivered by UK Mail. Remote areas may take longer, please click here for more info.

Click and Collect Next Day (order by 6pm Mon - Fri) (£2.95)



Returning orders to us is easy. Whatever your reason, we offer a refund or exchange within 28 days of delivery or collection.

6 39 6.5
7 41 7.5
8 42 8.5
9 43 9.5
10 44 10.5
11 45 11.5
12 47 12.5

Men's Footwear Size Guide

Measuring tips

Take your actual body measurements as they are more accurate than measuring over your clothes or shoes.

Feet: Use a ruler or tape measure to measure your foot (from the heel to the tip of your longest toe) Be sure to measure both feet. Many people have feet of different sizes. Fit to the larger of the two.

Remember, feet can expand over a quarter size during a full day's walk so ensure you get the right fit.

Ratings & Reviews

Overall Rating

4.50 out of 5
6 reviews
Write a review
4.50 out of 5

Cumfy boots, short soul lifespan?

Like these boots for comfort and keeping me dry. The one and only problem I had was the smaller treads around the edge of soul tend to rip off leaving an uneven foot hold. Only use on soft ground.

4.50 out of 5


My second pair of mammut boots from Go Outdoors, very comfortable in the dry and very grippy.
These boots are not waterproof.

4.50 out of 5

Comfiest boots

Walked the streets of Vienna for six hours dry weather, then walked a few days later Keswick to Latrigg then to Threlkeld back to Keswick via castle rig approx 12 miles in pouring rain , no blisters no leaks comfiest boots I’ve ever had .A really good buy

4.50 out of 5

Waterproof and comfortable.

These bad boys are as comfy as a pair of your favourite old slippers and as waterproof as any other good boot with goretex.
I plodged around High Cup Nick in November and my feet were bone dry and blister free after the 6 hour walk.
They're less stiff in the sole and the ankle than a pair of leather high gtx boots, but I guess that's the point. They're more trail walking than mountain squashing boots.

4.50 out of 5


Absolutely great boots out of the box comfort.. great price to..

4.50 out of 5

Very good

Very good and comfortable shoes

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