Arc'teryx Cerium SL Vest - Men's: 

As light and compressible as functionally possible, the Cerium SL down vest weighs a scant 125g (4.4 oz) but delivers exceptional warmth for its weight. The 850 fill power goose down’s warmth to weight ratio is outstanding, and the tear-resistant, wind resistant Arato™ 7 nylon shell is exceedingly lightweight. It primarily functions as a mid layer, but its efficient warmth and packability makes it an effective standalone for rest breaks, evenings at camp, or emergency bivvies.

CERIUM
Streamlined, minimalist and lightweight technical down insulation. High warmth to weight ratio.

Superlight
SUPERLIGHT
Superlight materials and design, emphasizing light weight and packability over durablity.

Arc'teryx Essentials
ESSENTIALS
Versatile high performance designs for diverse activities and conditions.

Down Insulation
DOWN INSULATION
Highly efficient natural insulation that compacts well and offers excellent warmth to weight.

Fit: Trim fit, Hip Length, Centre back length: 69 cm / 27.2 in