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Warm merino wool and lyocell base layers with soft, flexible comfort for outdoor school, skiing, snow play, and cold winter adventures.
Find Your Size
European sizes are based on your child’s height in centimeters. Because kids of the same age can be different sizes, height is the best guide for fit.
Enter your child’s height in inches, and we’ll show the closest CM size range. This correlates to the first number in the size option. ie: 98 or 122. If CM sizing is not provided, simply choose the age provided.
💡 Tip: These are general guidelines. Always check specific brand size charts when possible, as sizing can vary between manufacturers.
Product Description
The Reima Kinsei Kids Merino Wool Base Layer Set is made for the cold winter days when a dependable first layer makes all the difference. A soft blend of merino wool and lyocell provides warmth, temperature control, and comfortable next-to-skin wear for outdoor school, ski days, snowy playgrounds, and long family adventures outside.
Designed specifically for cold weather, the Kinsei combines 72% merino wool with 28% lyocell. Merino brings lightweight warmth and helps regulate temperature, while lyocell adds softness and durability. The fabric continues providing warmth even when damp, making it a practical foundation for active winter layering.
Why Parents Love It
- Made for cold weather: Reima designed the Kinsei as a warm thermal base layer for colder winter conditions.
- Merino wool temperature control: Soft merino wool helps regulate warmth as kids move between active play and quieter moments outside.
- Soft lyocell blend: Lyocell adds comfort and durability to the merino wool construction.
- Warm even when damp: The wool-blend fabric continues providing warmth when moisture is present.
- Comfortable for movement: Soft flat seams and strategically placed side inserts support comfortable, unrestricted play.
Built for Real Outdoor Use
Cold-weather adventures rarely happen at one activity level. Kids might hike slowly along a snowy trail, race up a sledding hill, kneel to investigate animal tracks, and settle down for snack time all in the same morning. The Kinsei is built for those changing rhythms, using merino wool for natural temperature control and lyocell for added softness and durability.
Thoughtful details make it especially practical beneath winter gear. Flat seams help keep the first layer comfortable against the body, side inserts support freedom of movement, and a longer back hem adds coverage as kids bend, climb, and explore. Pair it with a fleece or wool mid layer and weather-protective outerwear as conditions require.
Things to Know
- Merino wool blend: The fabric is made from 72% merino wool and 28% lyocell.
- Cold-weather base layer: Reima specifically designed the Kinsei for colder conditions and winter layering.
- Moisture-friendly warmth: The wool blend continues providing warmth even when damp.
- Comfort details: Soft flat seams, an elastic waistband, a longer back hem, and side inserts support comfortable movement.
- Layering: Wear as the first layer beneath insulating mid layers and weather-protective outerwear according to conditions and activity level.
- Sizes: The current Reima U.S. listing offers sizes from 12–18M through 14Y.
Product Details
- Product: Reima Kinsei Kids Thermal Set
- Product Type: Kids merino wool base layer set
- Material: 72% merino wool, 28% lyocell
- Thermal Performance: Merino wool blend provides temperature control
- Moisture Performance: Designed to provide warmth even when damp
- Seams: Soft flat seams
- Movement: Side inserts at the sleeves and body support freedom of movement
- Waist: Elastic waistband
- Top: Longer back hem for additional coverage
- Set Includes: Long-sleeve thermal top and matching base layer pants
- Best For: Outdoor school, forest school, skiing, sledding, winter hiking, snow play, and cold-weather layering
- Sizes: 12–18M through 14Y
Why ODSS Recommends It
The Reima Kinsei is one of our favorite base layers for genuinely cold outdoor days. The high merino wool content provides lightweight warmth and temperature control, while lyocell adds the softness and durability that make a first layer comfortable enough for hours of winter play.
We especially like it for outdoor school, skiing, winter hiking, sledding, and families who continue exploring when temperatures drop. It creates a warm, comfortable foundation beneath winter gear so kids can climb snowbanks, follow trails, build forts, and stay focused on the adventures happening around them.
Product Features
Materials & Care
Washing Instructions:
Materials:
Country of Origin: Imported
Style No: #5200029A
Pairs well with
How this gear performs
Each piece is rated for protection from water, wind and performance during play
Frequently Asked Questions
Is the Reima Kinsei warm enough for outdoor school in winter?
What makes the Kinsei different from a synthetic thermal set?
Does the Kinsei help with moisture during active play?
Is the Reima Kinsei itchy?
Can my child wear the Kinsei all day?
Should the Kinsei be worn directly against the skin?
FOUNDED BY WOMEN. BUILT FOR ADVENTURE.
ODSS was started by mothers who saw firsthand how time outside builds resilient, confident kids. What began as helping outdoor schools equip students for all-weather learning grew into a bigger mission: Help families raise resilient, confident kids by making it easier for children to stay outside longer.
Testimonials
For us, the right gear from ODSS supports what we believe most about childhood. When children are able to be outside every day, in all seasons, they become tenacious, confident, and develop an authentic relationship with the land.
— RAIN OR SHINE SCHOOL
Working with Outdoor School Shop has transformed our outdoor school community. Parents love knowing their children are consistently and reliably equipped—and that nothing is forgotten or comes home covered in mud.
— RANDOLPH SCHOOL
Our students get outside in all temperatures and having the right gear makes a world of difference. @outdoorschoolshop has gear appropriate for all seasons, has a directory to search for nature schools, and layering guides to help families know how to dress children for the weather
— HEMLOCK HILL
At The Thistle and Root, I always recommend ODSS gear for anyone who believes that children grow best through nature—so dress for it.
— THISTLE & ROOT
Ordering bulk with Outdoor School Shop was just as easy and seamless as I had hoped! As we open up a new program, preparing our first group of kiddos for any weather was at the top of our priority list, and ODSS came through with insight, expertise, and the coolest, most dependable gear around! Thank you ODSS!
— SIDNEY RIDGE
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