The Three-Layer System That Keeps You Safe in Tuscany's Mountains

In June 2026 I walked a group up to Lago Scaffaiolo under a full sun, with hardly any wind, and every one of us, me included, climbed in a T-shirt and sweated. We sat down to lunch at the Rifugio Duca degli Abruzzi, beside the lake. Before we’d finished eating, fog had filled the window and the wind had picked up, and we walked back down wearing all three of our layers, in a strong, cold wind.

That lunch is the whole case for this post. I guide in the Apuan Alps and the Apennines, and what my guests wear decides more of a mountain day than they expect. The three-layer system below is the one I ask every one of them to follow, for comfort and, more than that, for safety, because up there the weather can turn within an hour.

The base layer, and why never cotton

Your first layer is a technical shirt, made from synthetic fibre or merino wool. Never cotton, and I can’t stress that enough. Cotton soaks up your sweat and holds on to it, so after a demanding climb, the kind you do on the way up to Riserva Acquerino, you stop moving in a wet shirt and the cold gets into you fast, which is where a pleasant walk starts to become a risky one. A technical fabric moves the moisture away from your skin instead, keeping you dry and helping your body hold its temperature through the day.

The middle layer, for warmth you can take off

The second layer is your insulation. I usually suggest fleece or pile, and how thick depends on the season. For a summer walk in the Appennino Pistoiese a light fleece is plenty. Come autumn or early spring, and especially as you climb higher, you’ll want something more substantial.

What I like about this layer is how easily it comes off and goes back on. You adjust it to the conditions and to how hard you’re working.

The shell you never leave behind

The third layer is a shell jacket, and its one job is protection from wind and rain. Warmth is the middle layer’s work. What I want from a shell is a fabric that keeps the weather out and still breathes. Gore-Tex or a similar breathable membrane does both, letting the moisture from your body escape while it blocks what’s coming from outside.

I’d leave the purely plastic shells at home, the K-Way kind. They keep the rain out and keep your sweat in, so on a steep climb, when you’re generating real heat, the jacket turns into a personal sauna that works against you.

When each layer goes on

On most of my walks the shell stays in the backpack on the way up, and you climb in the base layer and the middle layer, which lets your body breathe while you work uphill. Then you reach a summit, or a ridge with a strong wind, or you stop for lunch, and that’s when the shell comes out. A body that stops moving cools quickly, faster still if you’re damp from the climb, and the shell cuts the wind chill and keeps you dry if the weather turns. On the ridge at Lago Scaffaiolo I’ve worn all three of my layers in July and still felt a little cold.

The numbers explain part of it. The top of the northern Apennines runs 12 to 18 degrees colder than Florence in the afternoon, in every month of the year, and my weather by month guide has the figures. The rest is speed, the kind that turned that June lunch around.

In summer the middle layer can stay at home. The shell goes in the pack on every walk, whatever the forecast says, because sudden rain with nothing to put on can turn a beautiful day into a dangerous one.