Why do motorcycle riders wear leather?

It is easily waterproofed. It is more resistant to ripping/shredding than other materials, in case of an accident. It doesn't flap in the wind.

My AnswerThe number one reason. Wind cannot penetrate leather, even on a warm day you will get cold riding a cycle.

Also, and the more important reason to me, is protection. Leather is much tougher than say, denim. Aside from being more durable, it also doesn't "grab" the road's surface if you wreck and cause you to tumble. Instead, you slide. And of course, leather looks great.

AnswerNot all motorcycle riders wear leather... Only those who ride on asphalt. As far as I'm concerned leather is the choice because it protects the skin if you happen to find yourself sliding down the street on your back after a crash. If you wear anything else it will shred and then your skin will get seriously damadged. AnswerNot all motorcyclists wear leather. It depends on the motorcycling you do and your personal choice. Mine is textile and I only ride on asphalt. Modern rip-proof materials with kevlar armour are becoming more commonplace; they are more stable, waterproof, breathable, comfortable and flexible than leather; whilst, with armour, offering the same if not more protection. Moreover, never seen the need to dance myself into a leather condom to look 'cool'.