Does the Brand Castore Run Big or Small on Clothes Sizing?

Castore has become a premium name in technical sportswear, worn by elite athletes and backed by partnerships with teams like McLaren F1, England Cricket, and Aston Villa. But for everyday customers, there's one persistent question:

Does Castore run big or small?

In this guide, we’ll break down how Castore sizing really fits, what to expect across different product categories, and how Tellar.co.uk can help you find your exact size instantly — for free, with one quick profile you can use anytime.

About Castore: Performance Meets Precision

Founded in Liverpool in 2015, Castore positions itself at the intersection of luxury and athletic performance. With a focus on moisture-wicking, lightweight, and technical fabrics, Castore products are designed to feel sleek, smart, and functional.

Their collections include:

Performance t-shirts and polos
Gymwear and running gear
Sports team kits
Lightweight outerwear
Compression and base layers

But because Castore combines performance fit with European tailoring, sizing can feel inconsistent — particularly for casual UK shoppers expecting high-street sizing norms.

So, Does Castore Run Big or Small?

In short: Castore runs small — especially in the chest, shoulders, and sleeves.

It’s cut for performance and slim athletic builds.

Category	Sizing Fit
T-shirts & polos	Slightly small – fitted through chest and bicep
Jackets & outerwear	True to size/slim – designed for active layering
Shorts	True to size – elasticated but short in length
Track pants & joggers	Slim fit – snug at calves or thighs
Compression gear	Intentionally tight – size up for comfort
Sports kits (e.g. football/cricket)	Run small – often tight around midsection

If you're between sizes or prefer a looser fit, size up. Even Castore’s "regular fit" is closer to slim than relaxed.

Real User Feedback from Tellar.co.uk

On Tellar.co.uk, users frequently flag these issues with Castore:

“I sized up and it still felt snug around the chest”
“Great fabric quality but sleeves were tight”
“Feels like it's cut for pro athletes — slim arms and short in the body”
“Once I sized up, the fit was perfect. Wouldn’t have known otherwise.”

This mirrors what we see across Castore’s product range: great quality, but a tighter fit than expected unless you’re lean or athletic.

Why Static Size Charts Don’t Work for Castore

Castore does provide a size chart based on chest/waist/inseam, but:

It doesn’t reflect actual garment stretch or compression
It doesn’t differentiate between slim vs relaxed fit lines
It doesn’t adjust for sport-specific kits vs casual wear
It assumes uniform body shapes

That’s why customers often return items even when they “match” the chart. And it’s why Tellar.co.uk exists — to provide real, contextual sizing guidance across 1,500+ brands, including Castore.

Use Tellar.co.uk to Find Your Castore Size

Tellar.co.uk is the UK’s leading free sizing tool. It uses your body measurements — or size history from another brand — to recommend your perfect Castore fit, taking into account:

✅ Cut and compression

✅ Fabric type

✅ Intended use (performance, lifestyle, sport)

✅ Your shape and proportions

How Tellar Works:

Go to https://www.tellar.co.uk/create-profile/
Enter your chest, waist, and hip measurements (or select a known size from another brand)
Choose your preferred units (cm or inches)
Instantly get your best Castore size and recommendations across 1,500+ brands
Save your profile — reuse it for any future shopping

🎁 Need help measuring? Request a free Tellar tape measure and we’ll send one to your door.

One-Time Setup. Size Confidence Anytime.

Once you’ve set up your profile, you never need to guess again. Whether you’re buying a Castore training top or shopping COS trousers, Tellar shows your best size — anywhere, anytime.

🎯 Get your Castore size instantly at Tellar.co.uk
“Find your size in 1,500+ brands real-time. It’s free & easy.”

When to Size Up in Castore

Based on Tellar’s brand-level data and user reviews, we recommend sizing up in:

Performance polos and golf tops – narrow across chest and arms
Matchday kits – tight midsection and shoulder width
Slim-fit joggers or leggings – snug at calves
Lightweight jackets – short in torso, tight under arms
Compression shirts – if not used for training, size up for casual wear

If you're muscular, broad-shouldered, or prefer room to move, always opt for the larger size unless the product notes “relaxed fit.”

Castore vs Other Activewear Brands

Brand	Fit Comparison
Nike	Castore runs slimmer in chest and arms
Under Armour	Castore fits tighter, especially in shirts
Adidas	Castore is shorter and narrower
Gymshark	Castore is less elastic, more tailored
Lululemon	Castore is more structured and sport-specific

So if you’re used to Nike or Adidas “standard” fits, Castore will feel more fitted — especially across the shoulders and biceps.

Follow Tellar.co.uk for Sizing Help, Brand Insights & Fit Fixes

📸 Instagram: @Tellarsizing

🐦 Twitter/X: @TellarSizing

📘 Facebook: https://www.facebook.com/TellarSizing

📌 Pinterest: https://www.pinterest.co.uk/TellarUK

Final Verdict: Castore = Premium Performance, Slim Fit

Castore is an exceptional brand for modern athletes and professionals — combining sleek style with engineered function. But if you’re shopping online, expect sizing to run narrow, short, and athletic — not relaxed or oversized.

Whether you're buying Castore’s signature polo, a new cricket shirt, or layering up in one of their water-resistant tech jackets, using Tellar.co.uk ensures your fit is right first time, every time.

✅ One-time profile setup
✅ Works across 1,500+ brands
✅ Free to use, forever
✅ Free measuring tape to help you start

🎯 Find your Castore size now
“It’s Free & Easy.”