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Guide
Kids' base layer bottoms
Base layer bottoms should fit your child now and move with them during play. Choose length and warmth alongside outer trousers, socks and boots rather than buying thick or oversized layers just in case.
Key points
- Choose a close fit without waist pressure or pulling at the crotch.
- Keep the hem above the ski boot rather than pushing it inside.
- For energetic play, consider how readily the layer dries.
- Cold breaks call for more warmth than continuous activity.
When will your child wear them?
| Use | Choose | Bear in mind |
|---|---|---|
| Active play | ChooseLight, flexible base layers | Bear in mindAn insulated outer suit changes how much warmth is needed beneath. |
| Cold breaks | ChooseWarmer full-length bottoms | Bear in mindConsider movement as well as the air temperature. |
| Tall ski boots | ChooseA shorter leg | Bear in mindSocks and hems should not form a thick ridge inside the cuff. |
| Long days | ChooseA comfortable wool blend | Bear in mindTry the feel against the skin and check the care needs. |
Which length fits underneath?
Full-length bottoms (To the ankle)
A full-length technical layer covers the legs beneath suitable outer trousers.
- Advantage: Continuous leg coverage
- Drawback: The hem needs space around tall boots
Cropped tights (Above the boot)
A shorter leg leaves the area inside the tall ski boot clear.
- Advantage: Less fabric against the shin
- Drawback: Leaves a gap with low-cut footwear
What to look for
| Question | In brief | Why |
|---|---|---|
| Which size? | In briefFit the current height | WhyOversized layers bunch beneath outer clothing. Ask your child to crouch and raise a knee without the waistband moving. |
| How warm? | In briefActivity and breaks decide | WhyA warmer layer can suit quieter days. Under a heavily insulated suit, less extra warmth is often enough. |
| Which fabric? | In briefFeel and drying | WhySynthetics and wool blends differ in feel and care. Let a child with sensitive skin feel the fabric directly. |
| Which length? | In briefTry socks and boots too | WhyThe hem should finish above a tall cuff. Avoid folding thick layers over one another inside a ski boot. |
Common questions
Should I buy a size up to grow into?
Choose for the current height. The waist and crotch should feel comfortable without large folds under other clothing. Recheck the fit as your child grows.
Does my child always need the thickest layer?
Match the base layer to activity and outer clothing. Running produces more warmth than waiting. Plan a suitable extra outer layer for breaks.
Can long bottoms stay inside ski boots?
Avoid thick hems and folds inside a close-fitting cuff. Cropped tights finish above it; with full-length bottoms, check the transition using the actual socks and boots.
How do I wash wool base layers?
Follow the care label for the particular model. Use the approved programme and a suitable detergent, then dry the garment as instructed by the manufacturer.
Last updated: November 2026
What does your child need beneath?
Energetic play
Choose a close layer that lets your child crouch and run. Match its warmth to the outer suit worn over it.
- Free movement
- Comfortable waist
- Consider drying
Wool and blends
Let your child feel the fabric. Compare the actual wool content and care instructions rather than choosing by the name alone.
- Soft feel
- Read wool content
- Follow care label
More warmth in reserve
Warmer bottoms help on quiet cold days. Still check movement and space beneath the outer trousers.
- Warmth needed
- Layer above
- No pressure points
Under ski trousers
A shorter leg is useful with tall ski boots. Compare the length and check whether a set also includes a top.
- Check length
- Sock transition
- Read contents
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