Your tot has graduated from crawling to penguin-waddling around, so you're about ready to make the leap from comfort of the pavement to the varied trail terrain--though, when you do, make sure you equip your Burley Stroller with the 16 Wheel Kit. This wheel kit consists of two, 16x3" push button wheels that tout knobby tread, meaning you're able to maneuver snow, sand, trails, and gravel like a boss.