Air Vapormax 2021 Flyknit "'Logo Pack - Wolf Grey Volt"' sneakers Nike's Air VaporMax 2021 appears in a full-grey colour with some neon accents. Here, the Flyease tightening system has been removed for a traditional lacing system and the heel clips and toe cap now have a thicker Swoosh on the panels. The usual Flyknit on the upper and the VaporMax Air unit stays the same.  Imported Composition Sole: Rubber 100% Outer: Fabric 100% Lining: Fabric 100% SIZE & FIT Measurement HEEL 1.6 in(4 cm) Sole height 1 in(2.5 cm)