Setup: These trainers feature a convenient slip-on bootie construction. To put them on, gently pull the shoe open using the pull tabs at the heel and tongue, then slide the foot in. For a more secure fit, especially during active play, tie the classic laces firmly. Compatibility: Designed for 'big kids,' these trainers are suitable for various foot shapes, with the lacing system allowing for adjustable snugness. The size `5.5 UK` indicates they are for children's feet in that specific UK sizing. Care: 1. Cleaning: For general cleaning, wipe the mesh upper and midsole with a damp cloth and mild soap. Avoid harsh chemicals. 2. Drying: Allow shoes to air dry naturally at room temperature. Do not use direct heat sources like radiators or tumble dryers, as this can damage materials. 3. Storage: Store in a cool, dry place away from direct sunlight when not in use to maintain material integrity. 4. Avoid Submerging: While durable, avoid fully submerging the shoes in water to protect the cushioning technology and adhesives.