FREE SHIPPING TO CANADA & USA ON ORDERS OVER $160*

BUY NOW, PAY LATER WITH AFTERPAY

Boys Base Layers

(7 products)

Under his snowsuit, a close-fitting warm layer makes the difference on the ski hill and at outdoor recess. He can choose a blue and beige gradient zip one-piece, two-piece sets, blue leggings or a plush pop-over, all made by Deux par Deux in sizes from 6 months to 14.

Boys get two merino options. The black Two Piece Merino Blend set is brushed inside and finished with ribbed cuffs and flat seams, while the black and blue gray Merino Wool Base Layer Sets have raglan sleeves; both knits are 60% polyester and 40% merino wool. Teal and white alpine scenery prints the blue mountain set, made from 100% recycled polyester that the brand calls fitted and stretchy.

Good to know

  • Sizes: his blue and beige one-piece is made for babies from 6m and for kids up to size 14, the mountain set adds a size 9 within its 2 to 14 run, and the leggings and pop-over skip size 9, while each merino style is cut in paired sizes 2/3 through 12/14.
  • Leggings: blue stretch knit, 94% polyester with 6% elastane, which Deux par Deux says wicks moisture; a logo elastic band sits at the waist.
  • Care: the merino blend set, mountain set and one-piece wash cold and tumble dry low; the raglan merino sets go on a gentle cycle and skip the dryer.

Snowy recess calls for a suit from boys snowsuits over the thermals, or a parka from boys winter coats and jackets, plus a pair from mittens and gloves for kids. Baby brothers start in baby boys base layers. Wondering whether a coat or a snowsuit suits his school days? Read our school coat vs snowsuit guide, then fill in hats and sweaters from boys winter clothing.
View as

  • Deux par Deux

    Two Piece Thermal Underwear Merino Blend Black

    $10200 USD
    View details

  • Deux par Deux

    Mid-Season Plush Pop-Over Polar Jacket Blue Mountain Print

    From $4900 USD
    View details

  • Deux par Deux

    Two Piece Thermal Underwear Blue Mountain Print

    From $5600 USD
    View details

  • Deux par Deux

    Thermal Underwear Leggings Blue

    From $2800 USD
    View details

  • Deux par Deux

    Merino Wool Base Layer Set Black

    From $10200 USD
    View details
  • Sold out

    Deux par Deux

    Merino Wool Base Layer Set Blue Gray

    From $10200 USD
    View details
  • Sale

    Deux par Deux

    One-Piece Thermal Underwear Blue And Beige Gradient

    From $2200 USD $4000
    View details

  • SHOP SALE

Boys Base Layers FAQ

What do boys wear under a snowsuit?

A close-fitting base layer goes under the snowsuit. Deux par Deux makes boys' base layers to wear as the first layer, adding warmth without limiting movement on the ski hill or at recess. Put it under boys snowsuits.

Is a two-piece set or a one-piece thermal suit better for boys?

The Deux par Deux two-piece set is thick brushed jersey with a half-zip top and an elastic-waist pant. The one-piece has long raglan sleeves and an asymmetrical zipper. Both are made to go under a snowsuit.

What sizes do boys' base layers come in?

The Deux par Deux two-piece set is listed in sizes 2 to 14. The one-piece thermal suits run from 6 months to size 14, and the merino wool set from 2/3 to 12/14. Use the brand's size chart, and check baby boys base layers for the smallest sizes.

What is the merino set made of?

The Deux par Deux merino set is a two-piece base layer in soft merino jersey, with a long raglan sleeve top with a round neckline and a pull-on pant with a stretch elastic waistband. Check the product page for full details before you buy.

How should a boy's base layer fit?

Snug but not tight works best, so he can bend and reach in a snowsuit. Size by his height and the Deux par Deux size chart rather than age alone. Finish the outfit with mittens and gloves.

Do you ship Boys 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 8–15 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 Boys Base Layers items?

Yes, within 14 days of receiving your order. Contact us 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.

Customers rate us 4.9/5 based on 56 reviews.

  • Visit our support center

    Expert help & advice

  • Check your order status

    Updates & tracking

  • Returns & exchanges

    All you need to know
Back to top

Compare /8