The chelsea befix sp is a stylish and comfortable group 2 3 high back booster without harness which is suitable for children between 15kg4733lbs 36kg4779lbs 40approx 4 years to 11 years41 it has a height adjustable head support with side impact protection that grows with your child lightweight and portable it is easy to move between cars it is used with the back unit attached throughout to provide maximum protection the extra padded cover is removable and hand washable in warm