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Men's Cool Silver Trunks

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Cool Silver Trunks are anti-bacterial and quick-drying, the foundation of a functional, active outfit.

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Colour: Night Sky/Mallard Blue
  • Night Sky/Mallard Blue
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The Full Story+

Our Cool Silver Trunks are light, comfortable and impressively high wicking. They’re enhanced with anti-microbial Silvadur™ odour control technology, based on silver chloride made from recycled silver. This clever, patented anti-microbial technology inhibits the growth of microorganisms and the associated build-up of odour.

We’ve improved the fit and shape, adding comfort and support where needed. Our new performance jersey fabric is slightly heavier and is easier to wash than cotton trunks and far quicker drying. As well as being softer, more supportive and packing down smaller, the flat-locked, low bulk seams reduce chafing and irritation. Plus, the elastic waistband offers maximum comfort. 

They’re so durable that no matter how often you wear them, they’ll never stretch, fade or lose their shape. In short, they’re the perfect undergarment for comfort and performance with added structure.

Fabric: 86% polyester, 14% elastane.
Weight: 75g
Pack Size: 150ml
Drying Time: 3 hours

Features at a Glance+
  • Lightweight technical trunks.
  • Fabric: 86% polyester, 14% elastane.
  • Dynamic Moisture Control™ wicking treatment.
  • Silvadur™ odour control technology. Based on silver chloride made from recycled silver.
  • Lightweight stretch fabric.
  • Durable.
  • Packable.
  • High wicking.
  • Quick drying.
  • Easy to wash.
  • Crease resistant.
Elemental Protection
Heat - Keep CoolHeat - Keep Cool

Keeping comfortable in the heat can be harder than keeping warm in the cold. Comfort strategies are limited. We choose the right weight of fabrics, employ Airflow™ weaves and use Dynamic Moisture Control™ technology.

Functional Features

Building stretch into our fabrics offers some big advantages. It allows us to make very comfortable, streamlined clothing. And a close fit has big advantages for active people. Clothes don’t flap in the wind, they work well in a layering system without bulking up and because there is less fabric, they are lighter, dry quicker and pack smaller – all critical Rohan virtues.

Our Technologies
Anti Odour SilverAnti Odour Silver

Tiny traces of silver are distributed evenly throughout the fibres of a garment. These inhibit the development of microbes that can grow exponentially in warm and damp areas, resulting in mould and odour. It is permanent, it will not wash out or wear out.

Dynamic Moisture ControlDynamic Moisture Control

Our Dynamic Moisture Control™ finish is a permanent, wicking treatment that rapidly spreads moisture, such as sweat, over a wide surface area of the fabric. This ensures the garment dries more quickly and you stay more comfortable - even in the hottest and most humid conditions.


Another first for Rohan. Unique Coolant™ technology works by embedding microscopic mica crystals into the knit of the fabric. This has an active, cooling effect on the body. Tests show that the temperature within the garment is two degrees lower than in normal, untreated clothing. In terms of comfort this is massive. In the search for new tactics to solve the age old problem of how to keep cooler in hot weather Coolant™ represents a real breakthrough and a significant step forward.

Fundamental Principles
Lightweight - Weight: 75gLightweight - Weight: 75g

We were the original lightweight revolutionaries. Back in the 1970’s we realised that cutting weight without losing performance meant that you can take less and do more. Everything we make is engineered to achieve this.

Packable - Pack Size: 150mlPackable - Pack Size: 150ml

Low pack size is a benefit whether you’re packing for a day’s walking or for the trip of a lifetime. We continually scrutinise fabric specification and garment construction to minimise the packed size of our clothing. The actual pack size is tested and listed.

Fast Drying - Drying Time: 3 hoursFast Drying - Drying Time: 3 hours

All Rohan clothing is designed to be very fast drying – as much a benefit for unexpected downpours as anything else. It’s easy to wash and often needs no ironing. Almost all garments will dry overnight, meaning you can take less with you. We test every item and list its drying time.

Size Guide+
Smart, crease-resistant, quick-drying travel shirt.

Mens Cool Silver Trunks

Mens Size Guide

What People are Saying

This product has a Rating of 3.7 / 5

Product Fit

Fits Small
True to Size
Fits Large

Quality of Product

Failed to meet expectations
Exceeded expectations

Value for Money

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Tom Rank
Age: Over 70
Purpose: Summer wear
Length you've had item: 1 year

Men’s Cool Silver Trunks: comfortable and light


Like Ivor Lee here, I've just got back from Greece (and Italy) where temperatures were 30 degrees C and more. I have several pairs and a few of the Ultra Silver version I found both versions very comfortable throughout the day.

Ivor Lee
Age: Over 70
Purpose: General use
Length you've had item: 3 months

Men’s Cool Silver Trunks


Bought to replace some of my Ultra Light Silver Trunks.

Worn in the UK for 3 months and not as comfortable as my older ones. Just returned from Greece where temperature was 35+. My old ultra lights kept me cool throughout day in the heat but cannot save the same for these new version. They felt uncomfortable in the heat and sweat retained. As a Rohan customer over about 30 years this is the first time I have come across a product that doesn’t work. A real pity

Age: Over 70
Purpose: Every day.
Length you've had item: One or two years.

Very comfortable all year round.


I have several pairs of these trunks and wear them all the time. They are light, comfortable, easy to care for.

The one fault I have found is that the material around the fly is a bit weak and begins to wear through as you, what shall I say, put everything back.

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