This adapter makes your Contours Options Tandem stroller suitable for two infants. Perfect for someone with twins. The stroller alone is compatible with one infant car seat, and this adapter turns the stroller into a dual car seat carrier. Compatible with many popular seats including: * Britax Companion * Chicco Key Fit * Combi Connection * Cosco Designer * Evenflo Embrace * Evenflo Discovery * Evenflo Portabout * Graco Safe Seat * Graco Snug Ride * Ped Perego Primo Viaggio * Safety 1st Designer 22