Britax is proud to be introducing the most exciting and significant child car seat development since the duo isofix the isofix base used in conjunction with the britax cosy tot is another first in the uk market and supports britax position as the worlds most innovative and authoritative car seat manufacturer following on from the success of duo and duo plus isofix44 the cosy tot isofix infant carrier uses the isofix system to provide a rigid connection to the vehicles chassis by using a