If skateboarding, surfing or snowboarding aren't extreme enough for you, jump on some Freelines.

A pair of "skates" with side-facing wheels mounted to independent decks that look like the result of a skateboard splitting in half, Freelines combine the skills of traditional board sports, but with a higher level of challenge and performance.

Compact enough to fit in a backpack or pocket, you can get your surfing or snowboarding fix on any paved surface, without having to lug a bunch of gear to the mountains or beach. Or wait for snow to fall, or waves to pump. And because you can just step off anytime - to go into stores, restaurants, etc. - they're more convenient for urban excursions than rollerblades.

Ride them anywhere the wheels will roll - streets, parking lots, empty pools, even uphill. And as expected, skilled riders are inventing new tricks that you'll just have to try, either achieving extreme sports glory, or a broken ass. (Check out some demo videos here.)

$149
www.freelineskates.com