Bolten SL 20°

Technical, superlight traditional mummy bags with stretch materials for comfort and mobility

Technical, superlight traditional mummy bags with stretch materials for comfort and mobility

Love the versatility and warmth of a traditional mummy shaped bag but not too keen on a confined fit? This bag is for you. Featuring PrimaLoft® Gold Insulation Active with stretch fabric side panels, you can move more freely, bend your knees, and sleep on your side while this amazing insulation keeps its insulating properties. More mobility plus less cold spots means more restful nights in the backcountry for you.
$289.95 to $299.95
100% Guarantee


Our top priority is to provide customer service as stellar as the award-winning products we create. If one of our products does not perform to your satisfaction, contact our customer service team and we will help you find gear that fits your needs.
$289.95 to $299.95

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Specs + Sizing

Bag WeightReg: 2lb 11oz / 1.22kg / Long: 3lb 1oz / 1.34kg
Fill WeightReg: 32oz / 909g / Long: 36oz / 1009g
Compressed Bag SizeReg: 32oz / 909g / Long: 36oz / 1009g
Stuff Sack SizeReg: 8in x 17.5in / 20 x 45cm / Long: 8in x 17.5in / 20 x 45cm


Primaloft® Gold Insulation Active in the stretch side panels

Low profile cordlock lets you un-cinch the hood with one hand

Anti-snag draft tube is soft and prevents heat loss along the zipper

Zipper Garage 

Interior fabric loops for sleeping bag liners

Exterior loops for hang drying or storage

Mesh storage sack & nylon stuff sack

Construction + Materials

Nylon rip-stop shell fabric with a water repellent finish 

Polyester Spandex stretch fabric shell and lining with a water repellent finish

Polyester Taffeta lining

Offset quilted construction 

PrimaLoft® Silver & PrimaLoft® Gold Active stretch insulation

65"/165cm YKK #5 zipper - regular bags

70"/178 cm YKK #5 zipper - long bags

Here’s what other people think.

What’s in a Name?

Known today as the Kimsey-Bolten Ranch located in nearby Hayden, Isadore Bolten purchased the land from former owner Leslie Kimsey in 1933. Bolten raised both sheep and cattle, and also grew hay, which for the time was an unusual combination of ranching due to the "range wars" the community was having at the time.