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Warm, moisture-managing Merino base layers made for active kids, outdoor school, winter layering, and longer days outside.
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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
Cold-weather adventures start with a comfortable first layer. The Helly Hansen Kids’ LIFA® Merino Midweight Base Layer Set includes a long-sleeve thermal top and matching bottoms, giving kids a warm, moisture-managing foundation for outdoor school, forest school, skiing, sledding, hiking, winter travel, and everyday cold-weather play.
Helly Hansen’s two-layer LIFA® Merino construction combines moisture-moving LIFA® fibers next to the skin with breathable Merino wool on the outside. As kids run, climb, sled, and explore, the inner layer helps move perspiration outward while the Merino wool provides insulating warmth and helps regulate temperature.
With midweight warmth, flatlock seams, and an easy-to-layer design, this set fits comfortably beneath fleece, snow gear, rainwear, and winter outerwear—making it a practical foundation for active days outside.
Why Parents Love It
- Complete two-piece set: Includes a long-sleeve thermal top and matching base layer bottoms for easy cold-weather dressing.
- Moisture management where it matters: LIFA® polypropylene fibers sit closest to the skin and help move perspiration outward during active play.
- Breathable Merino warmth: The Merino wool outer layer provides insulation, helps regulate temperature, and continues insulating when damp.
- Midweight without unnecessary bulk: Provides dependable cold-weather warmth while leaving room for fleece, snow gear, and protective outer layers.
- Comfortable for active kids: Flatlock seams create a smoother feel beneath additional layers.
- Versatile beyond outdoor school: A practical base layer for skiing, sledding, hiking, camping, winter travel, recess, and everyday outdoor adventures.
Built for Real Outdoor Use
Winter days rarely happen at one pace. Kids might race through the woods, climb a snowy hill, pull a sled, stop to investigate animal tracks, and then settle down for a snack. A good base layer needs to work through all of it.
LIFA® Merino gives the two fabric layers different jobs. The LIFA® inner layer helps move moisture away from the skin during high-energy activity, while the Merino wool exterior adds breathable insulation. Together, they create a practical first layer for kids who move between active play and quieter moments throughout the day.
The streamlined design also makes it easy to build a flexible cold-weather layering system. Wear it next to the skin, add fleece or another insulating midlayer when needed, and finish with weather-protective outerwear appropriate for the conditions.
Things to Know
- Midweight base layer: Designed to provide cold-weather warmth while remaining comfortable beneath additional layers.
- Two-piece set: Includes one long-sleeve base layer top and one pair of matching thermal bottoms.
- Merino blend: This is not a 100% Merino garment. The fabric combines 57% Merino wool with 43% polypropylene.
- Designed as a first layer: Wear it next to the skin so the LIFA® inner layer can effectively move moisture outward.
- Made for layering: Add insulating and weather-protective layers according to temperature, precipitation, wind, and activity level.
- Fit: Helly Hansen reports that customers generally find this set true to size. Check the current size chart when selecting a size.
Product Details
- Product type: Kids’ midweight thermal base layer set
- Includes: Long-sleeve base layer top and matching bottoms
- Material: 57% Merino wool, 43% polypropylene
- Construction: Two-layer LIFA® Merino
- Insulation level: Midweight
- Moisture management: LIFA® polypropylene inner layer helps move perspiration away from the skin
- Outer layer: Merino wool provides breathable insulation and continues insulating when damp
- Seams: Flatlock seams
- Waist: Elastic waistband
- Manufacturer-listed weight: Approximately 250 g
- Wool: ZQ-certified
- Main fabric: Solution dyed
- Manufacturer product number: 40526
Care
- Detergent: Use detergent formulated for wool.
- Washing: Wash inside out.
- Fabric softener: Do not use fabric softener.
- Handling: Do not wring.
Why ODSS Recommends It
For active kids, cold-weather comfort starts with the layer closest to their skin. We like the Helly Hansen Kids’ LIFA® Merino Midweight Base Layer Set because it combines two useful functions in one streamlined layer: LIFA® fibers help manage moisture while Merino wool provides breathable insulation.
It is also wonderfully practical for family life. The matching top and bottoms make getting dressed on cold mornings straightforward, while the midweight construction works beneath the fleece, snow pants, rain gear, and winter jackets kids already wear.
From forest-school mornings and snowy playgrounds to ski weekends and backyard adventures, this is the kind of hardworking layer made for real outdoor childhoods—and for helping families spend more comfortable time outside together.
Product Features
Materials & Care
Washing Instructions:
Materials:
Country of Origin: Imported
Style No: #40526
Pairs well with
Frequently Asked Questions
What is included in the Kids’ LIFA® Merino Base Layer Set?
How warm is this base layer set?
Will it help keep my child dry while playing?
Is the fabric soft or itchy?
What is the fabric made from?
Is this set suitable for outdoor school?
Can my child wear it for skiing or snow play?
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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