Your P3s should be fine to keep in. A lot of youth players in NZ and Australia use them - doubling up. The KPR P1 wicket keeping leg protectors have a similar shape to the P3s but are made of much higher density foam. Below a certain body weight the P3 foam and the P1 KPR foam won't make a huge difference, but if you are an adult or are starting to grow fast, then we would recommend the P1 KPR.