Rapha, nice but a bit pricey?

THx Regal & DJ...... oh the excitement of spending lots of £££

Stowaway/throwaway jacket is just a windbreaker

I want the rain jacket, everyone I know with them loves them

it's not just a windbreaker, it's the best wind and water resistant jacket. it keeps you dry for quite a long time before it wets out and dries quickly. if it's pissing down i'll wear a proper waterproof but that means boil in th ebag when the rain stops. even though i have e-vent and gore jackets they can't keep up with the amount of sweat you produce when cycling hard.

the stoaway is more versatile as it's comfortable to wear in a wider range of temps/weather conditions as it's more breathable.

stowaway would take you through autumn into winter and into late spring?

They lose water resistance with use

And I have not yet found a decent nikwax type wash to reproof it

They are great for road cycling where it seems the osmotic pressure of sweat going out keeps the rain from coming in

But when skidding in town with a bag on my back it let's water in too easily

stowaway would take you through autumn into winter and into late spring?

yes.

i wear mine most days if the temp is below 7° or looking like there might be some rain about.
(i'm talking rides not commutes)

Rain jacket for commuting

Throwaway for proper riding

brilliant, cheers Mr Smyth. I've got a swrve for commuting, but i really don't want to be wearing that when i'm out and about.

also: James, give up on using scientific terms when you don't know what they mean.
i'm fairly certain osmotic pressure isn't what makes the stowaway work. i imagine it's pore size in the material. and sweat as a vapour.

happy for a materials scientist to jump on board here.

ahhh osmotic pressure.
how i don't miss thee.

big pi is the osmotic pressure, btw.
this is why i had to resit biophysics in my 1st year.
look at that stupid equation.
biophysics on the whole, though is awesome to the power rad!

hang on.
i wish to apologise. it appears james may not have been throwing words around randomly.

James: Sorry.

(see capitalization, it must be true)

Was about to call damo names when I saw his post

Glad I read further down

i did a bit of reading, i still think you're throwing the word around like you know what it means. you just got lucky....

Nope

Did half a chemistry degree

It's about pressure across a membrane or wall

isn't it pore size in the membrane that's the limiting factor here?
(like leaf transpiration).

membrane on one side coated in fine film of water (rain), hot sweaty vapour on other (heat and concentrated solution) across the membrane?

something about temperature on the outside eventually stopping jacket from being sweat permeable?

class?

damo

you have water trying to come in, and a vapour trying to get out

as such like any membrane there will be a pressure going on on both sides

james:
that's what i've written. it's driven by heat. which is why waterproof materials tend to "sweat up" in warmer weather.

(i've got science skillz)

Rapha jackets don't work on that principle though - The surface works on the principle that rain is too common to fall on it.

Hah. Repped.

not so much temp though this has a function on the pressure

if the pressure outside is raised by weight of water this will have a similar effect - we are now quibbling

time for interspaz war of wurdz

tiswas repped

my stowaway will repel cheap cava, but delights at letting moet, mumm and others in

are you calling me a pedant?

fuck off

you is cunt

i iz pedant, you are not stealing that title from me

the sweat + solutes will cause a net osmotic gradient inwards, even with parity levels of water, the heat on the inside will make the water from the sweat more energetic and more likely to move, but won't necessarily make the movement outwards.
thus the likelihood is, you'll eventually get wet.
probably the sweat will not transpire out, whereas the water will probably come in.
I could be wrong, of course- as this is a guess.

also I haven't really thought it through fully.

i think the heat will drive the sweat up the osmotic gradient (water will want to come in as sweat = more concetrated (fool speak)).
once the temperature is equal, the sweat won't be able to leave.

that's my understanding.

is this bullying?

can i be banned for this?