Waterproof
The poncho is made of waterproof material and waterproof seams.
Baby seat and helmet compatibility
This poncho fits the vast majority of baby seats on the market and at Decathlon (Polisport, Hamax, Bobike, Thule, Quibbel, etc).
Its integrated hood is large enough to cover the head of a child wearing a helmet. It can be slipped over the child's head once he's settled in his seat.
Storage
When not in use, it can be easily stowed away in its "K-way" ventral pocket, the size of a small toiletry bag...
Version 2 enhancements
Version 2 of this poncho improves the strength of the seams in the belly pocket, where the poncho can be folded when not in use.