Sitting up to 3 yrs old or max seat load of 18 kg or 40 lbs. The superman strong aluminum frame and lightweight 2.2 lbs or 1 kg, makes this clip on high chair the perfect metoo* device to include your toddler at meals no matter where you are. They will sit tight in the 4 point safety harness & crotch restraint and the washable fabric makes for fuss free easy care & uber hygienic feeding, whether home or away. ASTM standards states to use only on tables 5/8 to 2 inches thick. (16mm to 50mm).