Outside Readers Can Get This Decathlon Down Jacket for Under $100

TL;DR: Outside readers can exclusively use promo code OUTSIDE20 at checkout to take 20% off the tester-approved Simond down jackets from Decathlon. Click here to shop.

Down jackets are notoriously Not Cheap. Depending on key features—waterproofing, type of insulation, fabric quality, and more—a puffy can quickly run up your shopping bill to several hundred dollars.

That’s why we’re always psyched when we discover, test, and love a more accessible version. Our go-to budget gear tester, Maggie Slepian, recently reviewed and approved the $119 Decathlon Simond MT100, calling it “a solid addition to my layering system.”

“The slim fit is perfect under a ski jacket and as a backpacking layer,” she writes in her full review. “…It’s incredibly warm for its weight, and I was surprised to see 800-fill power in such an inexpensive layer. I’ve worn this on its own on blustery 25°F days with just a thin fleece underneath and felt perfectly comfortable.”

At full price, the Simond MT100 Maggie tested is $119—but now through March 31, Outside readers can use promo code OUTSIDE20 at checkout to enjoy 20% off, making the Decathlon down jacket a mere $95.

Not sure the Simond MT100 is right for you? No sweat—this exclusive 20% coupon works for the MT100, MT500, and MT900 jackets in both men’s and women’s silhouettes.

Use OUTSIDE20 at Checkout for 20% Off These Decathlon Down Jackets

Decathlon Simond MT100 Down Puffer 

$119 $95 with code OUTSIDE20 (Men)

$119 $95 with code OUTSIDE20 (Women)

Decathlon Simond MT500 Down Puffer 

$179 $143 with code OUTSIDE20 (Men)

$179 $143 with code OUTSIDE20 (Women)

Decathlon Simond MT900 Down Puffer 

$249 $199 with code OUTSIDE20 (Men)

$249 $199 with code OUTSIDE20 (Women)

Valid only on Simond MT100, MT500, and MT900 through March 31, 2026. Must use promo code OUTSIDE20 at checkout to redeem.