Reset Merino Base Layer
S / Moss
£49.00
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Reset Merino Base Layer
£49.00
Layer up. Wind down. Stay cosy.
- Limited Test Run: Just three pieces, one each in S (UK 10), L (UK 14) and XL (UK 16).
- Missed Out? Join the waitlist here, tell me your size and favourite colour, and I’ll let you know as soon as the next run is ready.
- Seamless Construction: No side seams to rub or dig in, so it sits smoothly against your skin from warm-up to cool-down.
- Merino Blend: 63% lyocell, 21% nylon, 16% merino wool. Natural warmth without the bulk, and merino naturally helps keep odours at bay.
- Breathable & Quick-Drying: Soft, breathable knit that dries quickly after a sweaty session. Wear it on its own for easy miles, or layer it under a tee on harder efforts.
- Thumb Holes: Keep your sleeves in place and your hands cosy on cold, dark mornings.
- Reflective Fox Logo: Catches the light on the back, for a little extra visibility when the evenings close in.
- Limited Test Run: Just three pieces, one each in S (UK 10), L (UK 14) and XL (UK 16).
- A Note On Sizing: This is a tiny test run in the manufacturer’s standard sizing. I know that’s not the full size range you’d expect from KitFox, and I haven’t forgotten anyone. If these sell well, the next run will come in more colours and our full UK 8–22 range. Watch this space.
Fit and Features
The long sleeve I’ve been living in since September. It’s soft, warm and breathable, with seamless construction so there’s nothing to rub or dig in. It’s made for the days your legs need a rest but you still want to feel like you.
Wear it for yoga, walks and lazy weekend coffees. Or wear it as a base layer under a tee on cold, dark morning runs.
What you’ll love
- Seamless construction for a smooth, chafe-free fit
- Merino blend for warmth without the bulk
- Thumb holes to keep sleeves (and hands) cosy
- Reflective KitFox logo on the back
- Soft, breathable knit with a fitted shape
Fit & sizing
Fitted through the body and sleeves. If you prefer a relaxed fit, size up.
Sleeve length (underarm to cuff): S 47cm, L 49cm, XL 50cm. I’m 5'4" and the sleeves are just right on me, but if you’re taller or have longer arms, they may sit a little shorter on you.
- S (UK 10)
- L (UK 14)
- XL (UK 16)
A note on sweat
On hard efforts, due to the light green colour, you might see a few damp patches under the arms. The good news is the merino in the blend naturally helps keep odours at bay, so it still feels fresh after a sweaty session. For easy miles, wear it on its own. For tempo runs, layer it under a tee.
Why We Built This
Merino has been in our Foxy Socks from the start, and it’s the fibre I get the most love letters about. Warm when it’s cold, breathable when you’re working hard, and kind to skin. So I wanted to bring it into our activewear, starting with a top that’s ready for autumn and winter.
Sizing and Fit Notes
Fit & sizing
Fitted through the body and sleeves. If you prefer a relaxed fit, size up.
- S (UK 10)
- L (UK 14)
- XL (UK 16)
Sleeve length (underarm to cuff): S 47cm, L 49cm, XL 50cm. I’m 5'4" and the sleeves are just right on me, but if you’re taller or have longer arms, they may sit a little shorter on you.
Still unsure? Drop us a message at mary@runkitfox.com — we'll help you find your size personally.
Fabric and Care
Fabric Composition
63% Lyocell, 21% Nylon, 16% Merino wool
Care Instructions
Machine wash cold at 30°C with similar colours. Skip the tumble dryer — air dry only. No bleach, no fabric softener (it breaks down the stretch fibres over time).
For best results and to keep your kit smelling genuinely fresh, wash with an active sports detergent like Grangers Active Wash or add Dettol Laundry Sanitiser to your cycle. These are worth the investment if you're running regularly — they break down the bacteria that causes odour to build up in performance fabrics over time, which standard detergent alone doesn't fully do.
Look after your Reset Base Layer and it'll look after you.