The Hauck Bodyguard Carseat is well made with plush soft material that stays warm in winter & cool in summer, with added benefit of memory foam for comfort.
There is a little pull out compartment in the back where the instruction booklet is stored. We noticed the cover is not removal for washing but I suppose you just wipe down with a damp cloth.
The entire length of the seat at the back is about 25" this is at its smallest and does grow when you click the button at the top. The head width is 9" and this doesn't change even when pulled up to its highest setting. The width of the seat at its widest is 17"
Inside the seat, the size is about 12" in length and 10" wide at the back of the seat coming up to just over 12" width at the front of the seat bit. It does have sloping sides on the seat, but I measured the straight parts only.
The shoulder part does get wider the higher you pull up for children of different ages & sizes, so it will be a comfortable fit for your child. We tried it out with different age and different size grandchildren and they all commented on how comfy it felt. They said it was snug & comfy.
Definitely worth £77 as we have paid this for others which arent half as nice, comfy or well made like this one. My grandson said he felt like a racing driver sat with in the safety of the seat, it does seem to protect them from every angle. Cant say if it will stay comfortable on a long drive yet though.