The totseat attaches securely to the chair, enveloping your baby, a bit like an enormous, safe, nappy. It goes up over your little one's chest - not just as far as their waist - with the straps coming up under their armpits to fasten behind the baby's head, so that they can't wriggle out. Just button it up to shorten it for smaller chairs, extend it for bigger chairs, and tighten at the back for narrower chairs. Remember to always use the extra strap if the chair back is open (to avoid your little one slipping through the back).