The Phil and Teds doubles kit is a second seat attachment designed to adapt your inline buggy to meet the needs of your growing family. Attach this doubles kit to the front or back of your Phil and Teds Sport buggy and convert your single stroller into a double stroller. The doubles kit features a 2 position, one hand recline, comfortable seat liner with new moldable headrest, 5 point safety harness, a sun canopy and is meant for use from 3 months up to 4 years or the maximum load of 33 pounds (installed on back) or 44 pounds (installed on front). The doubles kit can also be used with the Sport as a parent facing seat in single mode giving you an additional mode for bonding time with your little one.