Extr4 U-KAIZEN GTX Waterproof Gore-Tex Runners (Black)
900+ Reviews on Trustpilot - Rated Excellent
A low-profile running trainer built on a waterproof textile upper with a GORE-TEX Invisible Fit membrane bonded directly into the construction, keeping the weather out without the bulk of a traditional lined boot. A cushioned technical sole unit underneath makes it an all-conditions everyday runner.
BIG FIT - WE RECOMMEND SIZING DOWN ONE SIZE.
Product code: 2200144
Upper: Waterproof textile / Lining: GORE-TEX Invisible Fit
Extr4 Reviews
Find Your Perfect Fit
At Union 22, we want to ensure you get the right fit every time. Our products are categorised into three main fit types to help you make the best choice:
-
Slim Fit – Designed for a tailored look. We recommend going up a size compared to your usual size for the best fit.
-
Regular Fit – A classic, true-to-size fit. Stick with your usual size.
-
Big Fit – Offers a more relaxed, oversized feel. We suggest sizing down for a more standard fit or keep as is for an oversized look.
Already Shopped With Us?
If you've purchased from Union 22 before, you may already know your sizes in the brands we stock. In that case, you can likely stick with the sizes you've previously ordered while following the fit guidelines provided for each product. However, if you're shopping with us for the first time or are unsure about sizing, we highly recommend using the chart below as a reference. Our sizing guide is designed to help you make the right choice and avoid the hassle of returns or exchanges. If you need further assistance, our team is always happy to help.
Size Conversion Chart
Tops: T-Shirts, Polos, Knitwear, Jackets & Coats
Use the table below as a general guide to converting sizes:
| UK Size | EU Size | US Size | Chest (inches) | Waist (inches) |
|---|---|---|---|---|
| XS (34) | 44 | 34 | 34-36 | 28-30 |
| S (36) | 46 | 36 | 36-38 | 30-32 |
| M (38) | 48 | 38 | 38-40 | 32-34 |
| L (40) | 50 | 40 | 40-42 | 34-36 |
| XL (42) | 52 | 42 | 42-44 | 36-38 |
| XXL (44) | 54 | 44 | 44-46 | 38-40 |
| 3XL (46) | 56 | 46 | 46-48 | 40-42 |
| 4XL (48) | 58 | 48 | 48-50 | 42-44 |
| 5XL (50) | 60 | 50 | 50-52 | 44-46 |
| 6XL (52) | 62 | 52 | 52-54 | 46-48 |
Bottoms: Trousers, Jeans & Shorts
| UK Waist | EU Size | US Waist |
| 28 | 44 | 28 |
| 29 | 45 | 29 |
| 30 | 46 | 30 |
| 31 | 47 | 31 |
| 32 | 48 | 32 |
| 33 | 49 | 33 |
| 34 | 50 | 34 |
| 35 | 51 | 35 |
| 36 | 52 | 36 |
| 37 | 53 | 37 |
| 38 | 54 | 38 |
| 39 | 55 | 39 |
| 40 | 56 | 40 |
Fit Type Recommendations
To help you pick the right size, refer to the fit type listed on each product page:
-
If the product is labeled Slim Fit, go one size up for a comfortable fit.
-
If the product is labeled Regular Fit, order your normal size.
-
If the product is labeled Big Fit, go one size down for a standard fit.
Additional Tips
-
If you’re between sizes and prefer a looser fit, consider sizing up.
-
For a tailored or fitted look, opt for the size recommended based on the fit type.
-
If you're unsure, feel free to contact our customer service team for personalised advice.
Need Help?
For any sizing queries, contact us at info@union22.co.uk or visit our Liverpool store to try on our pieces in person.
We hope this guide helps you find the perfect fit. Enjoy shopping at Union 22!