Arcteryx Atom Vest Arcteryx Proton SL Hoody It has a regular fit

It has a regular fit with a hip length hem along with articulated patterning for mobility and freedom

and promotes a smooth

Weighing only 576g and packing down to 28 x 15cm

The side panels are Polartec Power Stretch with a Hardface technology

Arcteryx Atom Vest Arcteryx Proton SL Hoody It has a regular fitThe Arcteryx Atom Vest provides core warmth and can be worn either as a mid or outer layer depending on the conditions and activity. When used as an outerlayer and the weather takes a turn for the worst then a shell jacket over the top will be a perfect, albeit a very warm combination. The Atom Vest uses Coreloft Compact 60 insulation, a lightweight synthetic insulation that is very compressible and light but expands very quickly when unpacked.