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Soft, lightweight kids’ base layer set with stretch and flat seams, made for active play, outdoor school, and comfortable everyday layering.
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 right base layer can make a big difference in how comfortable kids stay outside—especially when they are running, climbing, biking, sledding, or moving nonstop.
The Reima Sportti Kids Base Layer Set is Reima’s lightweight option for active play. Made from very light, soft, stretchy jersey, it gives kids a comfortable first layer without adding unnecessary bulk underneath rain gear, snow gear, fleece, or everyday outerwear.
Soft flat seams help keep the set comfortable against the skin, while the elastic material moves easily with busy kids. The pants have an elastic waistband for a simple fit, and both pieces are made from a recycled polyester blend with added elastane for stretch.
We especially like Sportti for milder winter days, transitional weather, high-energy outdoor play, and kids who tend to get warm once they start moving. It is also a practical everyday layer for outdoor school because it can stay on under regular clothes and be ready when it is time to add outerwear and head outside.
Why Parents Love It
- Very lightweight: Adds a comfortable base layer without creating bulky layers under rain pants, snow pants, jackets, or fleece.
- Soft and stretchy: Reima describes the jersey as super soft and elastic, giving active kids plenty of freedom to move.
- Flat seams: Soft flat seams are designed for extra comfort against the skin.
- Easy elastic waist: A simple waistband makes the bottoms comfortable and straightforward for everyday wear.
- Made for active play: Reima specifically designed Sportti for sports and busy movement.
- Contains recycled fibers: The fabric is made from 91% recycled polyester and 9% elastane.
Built for Real Outdoor Use
Base layers are the quiet workhorses of an outdoor wardrobe. Kids may not notice them when they are working well—and that is exactly the point.
The Sportti sits close to the body without adding much bulk, making it easy to build the rest of the day’s clothing around it. Add rain gear for a cool, wet morning. Pull fleece and snow pants over it when temperatures drop. Wear it under everyday clothes when outdoor time is part of the school day.
For kids who are constantly moving, a lighter base layer can also be a smart choice. They get the comfort of an extra layer without starting the day dressed for temperatures or activity levels that do not match how they actually play.
When Should I Choose Sportti?
- Choose Sportti for active kids: It is designed for sports, busy play, and children who generate plenty of warmth through movement.
- Choose it for lighter layering: The very light jersey works well when you want a base layer without a heavy thermal feel.
- Choose it for transitional weather: It is especially useful through fall, spring, mild winter days, and changing outdoor-school conditions.
- Choose a warmer wool base layer for colder conditions: If your priority is maximum warmth during prolonged cold, one of Reima’s wool-rich base layers may be the better match.
Things to Know
- Lightweight rather than heavyweight: Sportti is a very light base layer designed for active play, not Reima’s warmest thermal option.
- Two-piece set: Includes a long-sleeve top and matching bottoms.
- Current material: 91% recycled polyester and 9% elastane.
- Current size range: 3–4T through 15Y.
- Best used as part of a layering system: Add midlayers and weather-protective outerwear based on the temperature, activity level, and conditions.
Product Details
- Product: Kids’ lightweight base layer set
- Brand: Reima
- Model: Sportti
- Set includes: Long-sleeve top + bottoms
- Material: 91% recycled polyester, 9% elastane
- Weight: Very lightweight jersey
- Seams: Soft flat seams
- Waist: Elastic waistband
- Best for: Active play, outdoor school, sports, transitional weather, mild-to-cool days, and layering under rain or snow gear
Bulk Ordering for Schools & Programs
ODSS offers bulk ordering for outdoor schools, nature preschools, camps, and programs that want a practical layering option across multiple sizes.
Sportti is especially useful for active programs because it is lightweight enough to wear comfortably under regular clothing and outerwear without adding excessive bulk. That makes it easy to build into daily outdoor routines through changing seasons.
Contact ODSS for bulk availability, sizing support, and help choosing base layers for your school or group.
Why ODSS Recommends It
A good base layer helps the rest of a child’s outdoor gear work better. The Sportti is one of our favorite options for kids who move constantly because it is soft, stretchy, and light enough to disappear comfortably underneath the rest of their layers.
We especially like it for outdoor school, transitional weather, and kids who do not need the warmth or bulk of a heavier wool base layer. Wear it under rain gear, fleece, snow pants, or everyday clothes and adjust the layers on top as conditions change.
It is simple, comfortable gear that helps kids move freely and stay focused on climbing, running, building, exploring, and getting another hour outside.
Product Features
Materials & Care
Washing Instructions:
Materials:
Country of Origin: Imported
Style No: #5200034A
Pairs well with
How this gear performs
Each piece is rated for protection from water, wind and performance during play
Frequently Asked Questions
When should my child wear the Reima Sportti base layer?
How is Sportti different from a merino wool base layer?
Is the Sportti set warm?
Is it comfortable enough to wear all day?
Is this a good choice for kids who get hot while playing?
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
Outfitting the Programs That Keep Kids Outside
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