Because you're going to sweat and get wet anyway? Right? Wouldn't it be better to save 10+ oz. and get some water resistant wind jacket?
Because you're going to sweat and get wet anyway? Right? Wouldn't it be better to save 10+ oz. and get some water resistant wind jacket?
Marmot mica.
I personally would rather have a rain jacket and use it as a wind jacket than I would to have a wind jacket used for a rain jacket.
Short story IMHO? Stick with the rain jacket. Sweat soaked = Warm and wet. Rain soaked = cold and wet. cold and wet = possible hypothermia.
Colorless green ideas sleep furiously.
You could use an umbrella.
"Fish Camp Woman.... Baby, I like the way you smell"
- Unknown Hinson
FYI - I was just checking the Marmot web site. For men the now list a Super Mica with pit zips. Their specs list the Mica at 7 oz and the Super Mica just a little more.
http://marmot.com/products/super_mica_jacket?p=216,303
I used to think that too. I don't know what I was thinking.
Water is able to hold a lot of energy. It takes a lot of energy to heat up. Sweat is already at body temperature, so it can't cool you down unless it evaporates. Rain is much colder than your body, and has the ability to sap an incredible amount of heat from your body. I could pull out my chemistry books and show you the math if you care to learn more.
This is one area I don't like to skimp. As pointed out the wind jacket doesn't replace a rain jacket and the rain jacket doesn't replace a wind jacket. Since you can get wind jackets that weigh only a few oz, I like to take both.
So true. Latent heat of evaporation of water is 970 BTUs per pound (245 Kcal, ). Also since water transfers heat about 25 times better than air, the rain picks up a lot of your heat as it runs off of you on to the ground.
Like everyone said, a rain jacket does 2 things: Stops evaporation heat loss, and stops the cold rain from steeling your heat (think wet suit). A rain jacket will not keep you dry for long , it will keep you warmer when wet.
I don't pack alot of just in case items but a minimal rain jacket is always with me for safety, mountain weather can do some crazy things. You can go much lighter than 10+ ounces you just need to decide if you would rather give up money or durability.