Short answer: merino baselayers are the single best cold-weather upgrade a fly angler can make, because wool keeps insulating even when it's wet. Ibex makes superb ones. They're also expensive — and Minus33, a merino specialist we stock, gets you the same material science for considerably less.

Do you ever find yourself knee-deep in a chilly stream wishing you had more than your trusty waders to keep you warm? Fret not, my frigid friends. Let's talk baselayers.

Why merino wool for fly fishing?

We all love those quaint hand-knitted sweaters from Grandma, but they're not exactly state-of-the-art fishing gear. Think of a modern merino baselayer as Grandma's thermal hug, re-engineered by people in lab coats and then handed to anglers for a proper beating.

Here's the part that actually matters: wool is one of the only natural fabrics that has been tested time and again and still insulates whether it's wet or dry. Synthetics lose most of their warmth when they're soaked. Wool doesn't. On a river, where getting wet isn't a hypothetical, that's the whole ballgame.

Do baselayers wick moisture?

They do — merino wicks moisture like a sponge at a wine spill. So go ahead and sweat a little as you reel in that monster. Your baselayer has your back, your front, and even those awkward underarm areas.

It dries fast, too, which pairs with the thermal properties to make it genuinely important safety gear after an unintended dip in the drink. That's not a small thing on a cold day, miles from the truck.

Odor resistance: say what now?

Fishing isn't a fashion show, and sometimes you smell like it. But merino is naturally odor-resistant, so you can be the catch of the day without actually smelling like one.

I'm not sure about you, but when I go on a trip I pack four tops and four bottoms — and wear one top and one bottom the entire trip. I fish hard and go all day. When I'm done, eating and sleeping are the priorities. Changing is optional, and I don't mind being the grungy guy at the lodge. It just means I have to hear one less fib about the one that got away.

Pros and cons

Pros:

Super warm yet breathable — it's like your skin found its soulmate
Wicks moisture faster than you can say "is it raining or am I sweating?"
Odor resistant, so one set covers a whole trip
Lifetime value is enormous — good merino virtually doesn't wear out
Quality is through the roof. We're talking about a burger made of steak, not a steak made of burger.

Cons:

Not exactly budget-friendly. Your wallet might need CPR. Merino isn't cheap.

The same wool for less: Minus33

That one con is the whole reason this section exists. Minus33 is a merino specialist — wool is all they do — and we carry their line. You're buying the same fibre doing the same job, with less of the premium brand markup. Here's where I'd start:

Midweight Wool Long Sleeve Crew — the workhorse top. This is the layer I live in from October through April.
Women's Heavyweight Wool 1/4 Zip Top — the zip lets you dump heat on the hike in without stripping a layer off.
Midweight Wool Union Suit — funny as a gift, devastatingly practical in February. No gap at the waist is the point.
Lightweight Over The Calf Wool Socks — and go light to medium inside waders, not thick. You want space around your feet so circulation can keep them warm. A crammed boot is a cold boot.
Lightweight Fingerless Gloves — warm hands, working fingertips for knots.

Browse the full cold weather clothing collection, and keep it all alive with Nikwax Wool Wash — ordinary detergent strips the lanolin and stiffens the fibre, which is how most people ruin good wool without realising it.

The angler's guide to layering

Layer up, people. We're not baking a cake, but we are aiming for layers — comfortable, warm, breathable ones.

Each layer creates a thermal barrier. With each barrier you get insulation, the ability to pull one off and shed heat, and another space to transfer moisture through the wicking process. Two to three layers is usually enough. Prepare for the worst and layer up, so you can adjust as conditions change through the day.

Who is it for?

If you want high-quality clothing that lasts and works extremely well, premium merino is worth it. Most people gasp at the price, but factor in the materials, the fit, and the development that goes into them and it takes some of the edge off. I've been wearing merino for years — and what impresses me isn't the brand, it's how well it works and how long it lasts. Besides losing them, these things virtually don't wear out.

But if the price is what's stopping you from having any merino at all, that's the wrong outcome. Get the Minus33 and get warm.

One more thing worth carrying

A pocket knife. You never know when you'll need to cut a dry-rotted lace, shave some fire starter, or slice a camp steak. Look at The Peasant Folding Pocket Knife or the knives collection.

Wrap-up

Fishing can be a serious sport, but let's not forget the fun. Why not invest in something that makes you feel good, keeps you warm, and might even make the fish laugh? Fishing is a hobby, we do it in our spare time, and I want to look good and feel good in my time off.

More cold-weather reading: How to Stay Warm When Winter Fly Fishing.