I have used the Immersion Research Long Sleeve Zephyr Jacket Item#3687 on several outings. I have the mango/grey color.
The Immersion Research Long Sleeve Zephyr Jacket has helped to keep me keep warm during winter fishing trips. The material does a wonderful job of blocking the wind. It is water-proof and keeps dry unlike other jackets while fishing. The bright color helps me be highly visible out on the water so I don’t get run over by powerboaters. It is easy to clean, just throw it in the washing machine with cold water and hang to dry, it looks brand new. The material doesn't absorb body or fish odors like other fabrics. The fit allows me to move in any direction paddling and fishing without restriction.
The way the jacket is made the collar must be worn tight to keep it fully sealed. The fabric doesn't breathe well, so if it were worn in warmer temperatures you would sweat. The collar could be opened to vent the heat, but it would compromise the effectiveness of the product. When it is really cold a liner must be warn to keep warm because of the lack of insulation.
In conclusion, this has been my go to jacket for this winter seasons fishing. I believe it is well worth the money, and would suggest to anyone in the market for a good kayaking jacket.