How to Find Your Size in Aztech Mountain

By Ella Blake | Tellar Fashion Hub

Aztech Mountain runs true to size for most people — but with a fit designed for layering, understanding exactly how their sizing works will mean the difference between a jacket that flatters and one that buries you. Here's everything you need to know before you buy.

Who Is Aztech Mountain?

If you haven't come across Aztech Mountain yet, let me introduce you — because once you do, you'll wonder how you ever suffered through ski trips in anything else. Founded in Colorado and beloved by serious skiers and the fashion set alike, Aztech is firmly in the luxury performance category. Think slope-ready technical construction paired with the kind of clean, elevated aesthetic that looks equally good in the village restaurant after a long run. It's not cheap — but it's genuinely brilliant.

I first spotted an Aztech piece in a ski chalet in Méribel a few winters ago. A friend arrived in one of their quilted jackets and I embarrassingly spent the first evening asking her about it rather than the piste conditions. That was my introduction. I ordered my first piece that same week and have not looked back.

How Does Aztech Mountain Size?

Aztech Mountain uses standard US sizing, which translates as follows for women:

XS — UK 6–8
S — UK 8–10
M — UK 10–12
L — UK 12–14
XL — UK 14–16

The general consensus — both from customer reviews and my own experience — is that Aztech Mountain runs true to size. If you're between sizes, go up rather than down. The brand is built with layering in mind, so the cut already accounts for a base layer and a mid-layer underneath. A jacket that fits snugly over nothing will be miserable over a fleece on the mountain.

Key Fit Tips by Garment Type

Not all Aztech pieces fit the same way, and knowing the nuances has saved me more than one expensive return:

Ski jackets and outerwear: True to size, but if you have a broader shoulder or a fuller bust, size up. The structured shoulders on some styles can be unforgiving if you're caught between sizes.
Quilted vests and gilets: These come up slightly slimmer — especially through the chest. I'd recommend going up one size if you plan to layer a chunky knit underneath.
Ski trousers and salopettes: Check the inseam length carefully. Aztech's trousers have a longer cut, which is great if you're tall, but petite frames may find them overwhelming. The waistband has an adjustable element on most styles, which helps.
Base layers and thermal pieces: These follow a closer, athletic fit. Stick to your usual size — you want them snug but not restrictive.
Knitwear and après pieces: Generously sized. I size down on their sweaters; I find my usual size swamps me slightly.

A Word on Shoulders and Bust

This is the thing nobody tells you about luxury ski brands: they're often designed with a very specific body template in mind — typically on the athletic, narrow-shouldered side. If you carry more width through the shoulders or have a fuller bust, sizing up by one is the right call on technical pieces. You can always belt a slightly roomier jacket at après-ski; you cannot enjoy a day on the mountain with a jacket pulling across the back every time you pole.

What to Do If You're Between Sizes

My honest advice? Size up. Every single time with Aztech. Performance outerwear is not the place for vanity sizing. You will be wearing thermals, potentially a fleece or down mid-layer, and you need your arms to move freely above your head. I made the mistake of sizing down on my first Aztech jacket because I thought the larger size looked boxy on the hanger. On the mountain in full kit? The smaller size was suffocating. Lesson learned — never again.

How to Measure Yourself for Aztech Mountain

For the most accurate fit, take these measurements before you buy:

Bust: Measure across the fullest part of your chest, keeping the tape level across your back.
Waist: Natural waist — the narrowest point of your torso.
Hips: Fullest point, roughly 8 inches below your natural waist.
Inseam: Inside leg from crotch to ankle — critical for ski trousers.

Cross-reference these against Aztech's own size chart on their website, which is detailed and reliable. If any of your measurements sit on the boundary between sizes, use the bust and shoulder measurement as your guide for jackets, and the hip measurement for trousers.

Looking for Ski-Worthy Alternatives at Different Price Points?

If Aztech Mountain is outside your budget right now (it is an investment), there are genuinely good options across the price spectrum. Here's where I'd look:

Sweaty Betty — For performance base layers and ski-ready pieces that look polished. Their sizing is consistent and the quality-to-price ratio is excellent.
Lululemon — Their ski and outdoor range has expanded significantly. Great base layers and mid-layers with a sleek, non-bulky finish.
Barbour — For après-ski and cold-weather lifestyle pieces that nod to the mountain without being purely technical.
Reiss — Surprisingly good for elevated knitwear and smart casual mountain-adjacent styling. Not technical ski wear, but brilliant for the lodge.
The White Company — For cosy base layers, beautiful loungewear, and anything you'd wear getting changed at the end of the day in a chalet. Consistently excellent quality.
Boden — A hidden gem for ski-adjacent knitwear and colourful, well-made casual mountain layers.
Hobbs — Brilliant for après-ski supper dressing when you want to look effortlessly put-together without over-dressing on a ski holiday.

For two brilliant independent finds I'd also point you toward Fusalp — a French ski brand with incredible technical pieces and an almost couture-level finish — and Dorothee Schumacher, whose ski-adjacent knitwear and resort-wear is unlike anything on the high street. Both sit in the premium bracket and are worth every penny.

Never Guess Your Size Again — Try Tellar

If measuring yourself and cross-referencing size charts sounds exhausting, I completely understand. That's exactly why Tellar.co.uk exists — and it has genuinely changed the way I shop online.

Tellar is the UK's leading free sizing tool. You measure once — bust, waist, hips, or just enter a brand size you already know fits — and Tellar instantly matches your body to the correct size across 1,500+ brands, including Aztech Mountain.

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Honestly? It's one of those tools I wish had existed years ago. No more agonising over international size conversions or risking an expensive return. Just your size, instantly.

→ Visit Tellar.co.uk