Size guide
Size Guide
Our merino has a close, next-to-skin fit by design. If you are between sizes, stay true to size for base-layer use or size up for a more relaxed everyday fit. Free returns within 30 days, so ordering two sizes and sending one back is completely fine.
How to measure
Chest — around the fullest part of your chest, with the tape level under the arms.
Waist — around your natural waistline, with the tape comfortably loose.
Hips — around the fullest part of your hips and seat.
Inside leg — from the top of your inner thigh to your ankle bone.
Measure over light clothing, keeping the tape snug but not tight. Tap any chart below to open it full size.
Men's Base Layer Set
Need different sizes for the top and the bottoms? Build your own set →
Women's Base Layer Set
Need different sizes for the top and the bottoms? Build your own set →
Kids' Base Layer Set
Men's T-Shirt
Women's T-Shirt
Men's Long Sleeve
Same body measurements across 165, 190, 250 and 320gsm.
Women's Long Sleeve
Kids' Long Sleeve
Men's Long Johns
Women's Thermal Leggings
Kids' Thermal Leggings
Men's Half Zip
Women's Half Zip
Merino Wool Socks
Beanies, snoods and balaclavas
Still unsure which size to pick? Email info@merinotech.co.uk with your height, chest and waist and we will recommend a size. Free UK delivery over £49 and free returns within 30 days.
- Free shipping over $49.99
- 30-day easy returns
- Ships in 1–2 business days
Description
Kids' Merino Wool Thermal Top
Keep your kids warm, dry, and comfortable all day with our midweight merino wool base layer top for kids, crafted from 100% superfine 19.5-micron merino wool. Designed for daily wear, this thermal long sleeve shirt is the perfect choice for school, outdoor adventures, and layering in cold weather.
✅ Soft & Itch-Free Comfort
Made with premium superfine merino wool, this kids' thermal top is soft to the touch and gentle on sensitive skin — no itching, rubbing, or irritation like with synthetic fabrics or cotton.
✅ Natural Temperature Regulation
Merino wool naturally regulates body temperature, keeping your child warm in the cold and cool when it's warm — making it ideal for year-round use.
✅ Moisture-Wicking & Odour-Resistant
Our kids’ merino wool base layer wicks away moisture and resists odours, keeping your child fresh and dry during play, sports, or daily wear.
✅ Perfect Gift with Eco-Friendly Packaging
Packaged in a stylish and sustainable box, this merino wool thermal shirt makes a thoughtful and practical gift for kids of all ages.
✅ Merino.tech Promise
We stand behind the quality of every item. Your satisfaction is guaranteed — or your money back.
Care
Turn inside out. Machine wash cold on a gentle cycle with a wool-safe detergent. Do not bleach. Lay flat or hang to dry.
Shipping & returns
Free UK delivery on orders over £49. Ships in 1–2 business days. 30-day free returns on unworn items with tags.
Kids' merino
Soft merino for kids who never stop moving
Non-itchy merino that keeps kids warm on the slopes, breathable at recess and odour-free after a full day outside. Machine washable and built to survive the season.
Size guide
Kids LS
Fit
A close fit that stays put under ski kit and school clothes. Between sizes? Take the larger size to leave room to grow.
How to measure
- Chest – around the fullest part of your chest, tape level under the arms.
- Waist – around your natural waistline, tape comfortably loose.
- Hips – around the fullest part of your hips and seat.
- Inside leg – from the top of your inner thigh to your ankle bone.
Measure over light clothing and keep the tape snug but not tight. Still unsure? Email info@merinotech.co.uk with your height, chest and waist and we will recommend a size. Unworn items can be returned free within 30 days.
THE FABRIC
Why merino wool
Merino wool moves sweat away from your skin as vapour and lets it evaporate from the fabric, so you stay dry and comfortable whether you are hiking, commuting or skiing.
Merino fibres naturally resist the bacteria that cause odour, so you can wear a base layer for several days, on the trail or while travelling, and it still smells fresh.
Wool can absorb up to 30% of its weight in moisture without feeling wet. In damp British weather it keeps insulating where cotton and polyester leave you cold.
Merino absorbs UV radiation: our lightweight layers offer UPF 25 and the midweight and heavyweight options UPF 50+, handy on long days in the hills.
Merino wool is naturally hard to ignite and self-extinguishes without melting onto the skin, unlike synthetic base layers.
Merino is a natural, renewable and biodegradable fibre. Sheep grow a new fleece every year, and a worn-out merino garment breaks down instead of shedding plastic microfibres.
FAQ
Kids' merino base layers: FAQ
What is this 250gsm base layer top best for?
It is a midweight 250gsm merino layer, best for school ski trips, winter sports and cold days. Compare every weight in our merino weight guide.
Is this base layer top warm enough for skiing?
Yes. 250gsm midweight merino under a ski jacket and trousers is the most popular choice for a ski holiday. Choose 320gsm if you feel the cold.
Is merino wool itchy for children?
No. We use superfine merino that is soft against the skin, so children who refuse scratchy wool jumpers are usually happy to wear it all day.
What should my child wear on a school ski trip?
A merino thermal top and bottoms under their ski jacket and salopettes, plus merino socks and a beanie. A 250gsm set keeps them warm on the slopes without overheating in the chalet.
How do I choose the right kids' size?
Sizes are based on age and height. Base layers should fit close to the body, so choose the size that matches your child now rather than buying several sizes up. See the size guide.
Can kids' merino go in the washing machine?
Yes. Wash inside out at 30°C on a wool or delicate cycle and dry flat. Keep it out of the tumble dryer to prevent shrinking.
Is merino good for kids who get hot and cold quickly?
Yes. Merino regulates temperature and wicks sweat, so it keeps active children comfortable when they run around and warm when they stop.