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The word onesie didn’t always evoke high performance. Rather, it used to conjure��images of silliness: footie pajamas, DIY��Halloween costumes, and gaper-day ski suits. Today’s onesies, however, are as��utilitarian as they are just plain fun.

Helly Hansen��Ullr Powder Suit ($850)

Take Helly Hansen’s Ullr Powder Suit. When waist-deep snow is in the forecast, this is the ultimate armor. The neon orange, wind- and waterproof body shown here is reminiscent of a hazmat suit, earning chuckles and compliments in the lift line. On the hill, the seam-sealed polyester-polyurethane body eliminates the scourge of snow getting down your pants yet breathes, thanks to inner-thigh and underarm vents.

Shandoka 1Z 2.0 ($180)

Then there are the base-layer onesies, which beg to be worn from first chair to fireplace. The most stylish of the lot is the Shandoka 1Z 2.0��from Corbeaux Clothing, which doesn’t require you to look like a toddler at a sleep­over. The Aspen-based brand simultaneously delivers cushy comfort and a roomy, athletic fit with the backcountry-ready piece. The Shandoka has plenty of performance chops, too, including a stretchy spandex-and-recycled-polyester fabric, an over-the-boot cut, and thumb loops for more hand coverage.��

Airblaster Ninja Suit (From $110)

Still in the game is the original Airblaster Ninja Suit—the brand has been crafting onesies for over a decade. Get the Ninja Suit in polyester or upgrade to a wool blend for better moisture management. Sporting a 350-degree zipper around the waist—blessedly making calls of nature way easier—these long johns also have a seven-panel hood for a dome-cradling fit.

Patagonia��Capilene Thermal Weight One-Piece��Suit ($199)

For missions in teeth-chattering tem­per­a­tures, wrap yourself in Patagonia’s Capilene Thermal Weight One-Piece Suit. Crafted from thick and stretchy Polartec Power Grid fabric and coated with Polygiene’s odor-quashing silver-chloride treatment, the One-Piece is warm enough for lying still during a snowy bivy, though you’ll find it wicks moisture well when you’re sweating buckets on the skin track, too.