How to Stay Warm Winter Fly Fishing: Full Layering Guide - Fly Fishing Insider Podcast

Short answer: staying warm in winter is a layering system, not a single warm coat. Wick moisture at the skin, trap air in the middle, block wind on the outside — and keep your socks thin, because a crammed boot is a cold boot. Here's the exact setup I use, head to toe.

My opinion is that winter fly fishing is frankly better than summer. Fewer anglers on the water, the wind and blowing ice crystals like a symphony, and my local river runs a size 22 midge hatch every morning like clockwork — dry fly heaven for trout.

The only downside is that it takes a while to work out how to stay warm. It was two seasons before I decided enough was enough with the cold. Before that I was just worried about getting out. Then I finally figured out there's a difference between getting out and getting out comfortably.

I went back to what worked for backcountry skiing, ice climbing, and ski mountaineering. Those techniques all work, but the activity level is high. The closest comparison to winter fly fishing is belaying on an ice climb — the low-output parts of each sport.

Why layering works

Thermal regulation. Multiple layers let you shed one when you overheat and add one when you cool, matching your insulation to your activity level as the day changes.

Moisture management. Moisture, from sweat or from outside, destroys the insulating properties of most materials. A wicking base layer moves perspiration off your skin so you stay dry, and mid and outer layers block external moisture while letting internal moisture escape.

Insulation. The physics is worth understanding, because it changes how you buy:

Trapped air. Air is a poor conductor of heat, so it insulates when held in small pockets. Fleece, down, and wool do this within the material — but wearing several layers also creates pockets between them. Each one slows heat transfer.
Wind protection. Wind strips away the warm air surrounding your body. A windproof outer layer preserves everything underneath it.
Reduced conduction. Direct contact with cold ground or icy water pulls heat out fast. Layers reduce that contact.
Fewer cold spots. A single layer has inconsistencies. Several layers cover each other's gaps.

Core temperature and blood flow. Your body defends core temperature above all else, and it does that by reducing blood flow to your extremities. That keeps vital organs warm at the cost of your fingers and toes. In winter fly fishing we rarely see core temperature plummet unless you go in the drink — that's an emergency, and it's rare. Far more common is the sacrificial version: a slightly lower core, and cold fingertips and toes as a result. That familiar cold-hands feeling is restricted blood flow.

One buying note before the list: choose drab colours that blend with your surroundings or the sky. Bright colours photograph beautifully and act as a warning flag to skittish fish.

I'm not using electric technology here. Options exist, but you're limited by battery life, and when travelling a non-electric system doesn't fail and leave you up the creek. At home, with a system you're willing to maintain, heated gear can be a joy.

How to protect your body

A thin hat. The key word is thin — you want it under a hood without bulk. The Brown Trout Patch Ribbed Knit Beanie or the Moonlit Beanie both work. If you fish into dark, the ACTIV 520-Lumen LED Beanie puts a light where you're looking without a headlamp strap.
A neck gaiter. Thin to win again. A properly finished gaiter with wind resistance beats the cheap unfinished versions — try the FFIP Logo Neck Gaiter or the Bionic Caddis. More in hats, beanies and neck gaiters.
A base layer shirt. Wool or synthetic, and the start of the whole system. The Midweight Wool Long Sleeve Crew is what I live in, and the Women's Heavyweight 1/4 Zip adds a zip for dumping heat on the walk in.
A mid-layer. Thinner but with loft, to create air space above the base layer. Look for three things: a full zipper so you can vent or shed it, hand pockets since it's often worn as an outer layer, and a chest pocket — I don't buy shirts without them any more, because my phone, keys, and grocery list all end up there. The FORLOH Raider Fleece Vest and Women's Merino Hi-Loft Insulator Vest keep your core warm with arms free to cast.
A hooded puffy. Synthetic is the only way to go — it keeps insulating when damp, which is a winter requirement. The hood is critical, because it's your primary way to shed or add heat quickly. The Deckhand Puffy Jacket covers this; the FORLOH ThermoNeutral Down Hooded Jacket (also in women's) is warmer for the weight, but it's down, so keep it dry.
A waterproof shell. I prefer a heavy 3-ply. Toughness, water, and wind resistance are what matter. Get one designed for fishing and make sure it has wrist gaiters — that's critical when rowing or handling fish, because without them water runs down your wrists and soaks every layer on your arms. Look at the Whetstone Waterproof Wading Jacket, the Deep Eddy, or the Gale Waterproof Rain Jacket. Refresh the finish with ReviveX rather than replacing a jacket that's wetting out.
Non-cotton underwear. Wool is preferred. The Acadian Lightweight Merino Boxer Brief, the Woolverino Microweight Brief, or FORLOH's SolAir Chilly Fresh Boxer Briefs.
Base layer pants. I prefer merino, and I like a three-quarter length so I don't bulk up my lower leg inside a boot. The Chugach Heavyweight Zip-Off 3/4 Bottoms are exactly that. Full length: the Midweight Wool Bottom, or for women the Heavyweight Wool Leggings and Magalloway Lightweight Bottom. The Midweight Wool Union Suit removes the waist gap entirely.
Mid-layer pants. One of the best investments I've made for winter warmth: an insulating pant over the base layer and under the waders. Synthetic is key, because if you sweat or get wet it still insulates. I also want a style I can wear after the waders come off that doesn't look like pyjamas.
Waders. Good waders matter, and for winter I want bootfoot — it's an entirely different insulation approach that keeps your feet further from the cold. The Slipstream PVC Bootfoot Chest Wader does this, and the SUMMIT Insulated 1600g is the warmest breathable option we carry. Care for them and they'll last years. Here's my wader review, and follow my tip about filling them with silica packets.

Socks: the part most people get wrong

Most people think heavy socks are warm socks. They are, when you're sitting by a fire. In a boot they're close to useless, because they take up too much space and squeeze your foot, which limits circulation — and circulation is what actually keeps toes warm.

Get mid-height merino, slightly loose, and thin. Create space in your boot and keep the blood flowing. The Lightweight Over The Calf Wool Socks are the ones. Keep the Heavyweight Mountaineer for camp afterward.

Still want heavy socks? Then you need genuinely abundant room in your boots and neoprene booties. The problem is most people size boots while wearing thin cotton socks, so if you switch to a heavier sock you must size up accordingly.

Wash it all with Nikwax Wool Wash — ordinary detergent strips the lanolin and stiffens the fibre, which is how most people quietly ruin good wool.

How to protect your hands

My approach: no gloves, and obsessive drying. I wear gloves walking in and between spots. While fishing I use my pockets instead, and I'm extremely diligent about getting water off my hands immediately. I stuff a towel in the top of my waders and dry my hands after every fish, every fly change, every time I lean on a bank. Wet hands are what make you cold, not air temperature.

I keep a towel clip on the outside of my jacket so the towel stays dry. That works in Utah — in a damp climate like my hometown of Pittsburgh, it won't, and you'll need gloves.

Fingerless gloves are the compromise that actually works on the water: warm hand, working fingertips for knots. The Lightweight Fingerless Gloves are cheap enough to keep a spare pair in the truck.

Nitrile gloves are worth a mention. On really cold days they preserve dexterity while keeping your hands dry. Some people swear by them. Personally I don't care for them, but try them a few times before deciding.

Hand warmers in your outside pockets can be a game changer. I don't always use them — my hands run warm and I'm lucky that way — but if you get cold hands, put one in each pocket. You can cast and fight a fish one-handed while the other warms up, which matters most right after you've dipped a hand to release a fish.

That's the system

A complete outfit for staying warm and comfortable in winter. I've used this setup for several years and it's made a tremendous difference to my comfort — which, in turn, is what lets me fish the empty rivers all winter instead of going home at eleven.

Best of luck out there, and go enjoy the winter solitude.

Browse the full cold weather clothing collection, and read my merino baselayer review for more on why wool beats synthetics when things get damp.

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