Merrell Kids Hilltop Ventilator Hiking Shoes Boots Grey/Pink 13. Merrell Hilltop Ventilator Mid WTP Girls Hiking Boots / Trainers - The Merrell Hilltop Ventilator Walking Boots utilise a stroble construction for enhanced comfort and flexibility, with a breathable and waterproof lining complete with antimicrobial treatment. Girls walking boots. Leather and textile upper.Waterproof / breathable lining. Stroble construction. Antimicrobial treatment. Merrell Air Cushion. EVA midsole.