For rainy days...

(un) K-way = a windbreaker. Strictly speaking, this is the name of the brand that's responsible for these fantastic windbreakers that you could roll up into small bundles and wear around your waist:
Its popularity turned it into a common noun, as in this rhyme from French rapper Booba:
"T'es un vrai gars, ouais
Depuis hier, moi depuis mon premier K-way"
Le son qui met la pression

(You're a real man, yeah
Since yesterday, I've been one since my first k-way)