The Compressor Vest is considered a heavyweight mid layer piece or a super lightweight outer that gives superb freedom of movement whilst on the crag. It allows your arms to work hard and not over heat while it keeps your core protected from the cold winds.
The Helium 30 outer fabric is highly windproof protecting the nice warm air that is trapped within the PrimaLoft insulation.
The Compressor Vest packs into its own pocket and can be attached to your harness using the stitched in crab loop, so when you do get a bit too warm you can stow it away but still have it close to hand.
Helium 30 outer is exceptionally lightweight and windproof
PrimaLoft GOLD insulation [60g with 40g arms and side panels]
Quilted body construction
2-way YKK moulded centre front zip
2 zipped hand warmer pockets
Napoleon chest pocket
Dual tether hem drawcords and non-absorbent stretch cuff binding
Packs into hand pocket with karabiner carry loop
For all you kit geeks out there, the links below will take you to Mountain Equipment's Information pages where they will explain this jackets different fabrics, fills and constructions techniques in greater detail.
Helium 30
PrimaLoft Gold (Formerly known as PrimaLoft One)
Dual Tether Hem Drawcords
Most people are scared to wash their outdoor jackets but like all equipment it does need to be maintained. It is actually really easy! Feel free to give the shop a call from 09:00 until 17:30 Monday to Saturday (19:30 on a Wednesday), as we are always happy to help and give friendly advice.
Or if you are reading this outside our normal opening hours here is a useful link to Trekitt's recommended product for washing and caring for kit.
Nikwax Tech Wash
Nikwax TX-Direct
I hope this helps.