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.