for use in the rain..
dry weather tyres are usually slick (without grooves)
in F1, there are 4 types of tyres..
Soft Dry (white band around it)
Hard Dry (totally black)
Intermediates (for use when track isn't that wet)
Wets (for use when the place is totally wet as heck)
in F1, their "slick" tyres now have 4 grooves which do not do much
for channeling water away so that the tyres can grip the surface of
the road..
mostly racing slicks look like this:

and wet weather tyres look like this:
