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Kids Thermal Underwear & Base Layers

(42 products)

Thermal underwear and base layers for babies and kids from Deux par Deux: one-piece and two-piece thermal sets, thermal leggings and merino blend styles, made to wear under a snowsuit.

Shop by child in girls base layers, boys base layers, baby girls and baby boys, then pick a snowsuit to go on top.
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Kids Thermal Underwear & Base Layers FAQ

Why wear a base layer under a snowsuit?

A thin layer next to the skin helps keep kids warm and comfortable on long days outside, like ski days or recess in the cold.

One-piece or two-piece thermal set?

A one-piece stays tucked in for babies and toddlers; a two-piece is easier for older kids who use the bathroom on their own.

How should a base layer fit?

Close to the body without being tight. Use the size chart on each product page.

Do you ship Kids Thermal Underwear & Base Layers to Canada and the US?

Yes. Every order ships from Canada, usually within 1–3 business days, with an estimated delivery time of 6–10 days within Canada and 5–10 business days to the US. Shipping is free on orders of $160 CAD or more in Canada and $160 USD or more in the US; smaller orders ship for a flat $15.95 CAD or $10.95 USD. US shoppers see prices in US dollars, and US orders are subject to customs duties and taxes, which are paid by the customer. See our shipping policy for details.

Can I return Kids Thermal Underwear & Base Layers items?

Yes, within 14 days of receiving your order. Start your return from your orders by selecting Request return before sending anything back; items must be unworn and unused, with tags and original packaging, and return shipping is paid by the customer. Full details are in our return and refund policy.

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