Spitfire Formula Four Lock-Ins Full Skateboard Wheels 99d 54mm Size:54 these warm

these warm

maybe this is what they mean

High-performance polyester and spandex blend repels moisture while the DWR coating beads water off so your face stays dry

* V-Science Stretch Oxford w/ Repreve & Non-Fluorinated DWR

makes sure they stay in place during any activity

Spitfire Formula Four Lock-Ins Full Skateboard Wheels 99d 54mm Size:54 these warmFormula Four Urethane: An unbeatable, lasting performance urethane. Fast, long lasting, abrasion resistance with a smooth anti slip slide and controllable grip. 99 Duro: made for speed and lasting control on all surfaces. Lock Ins Full: A wider version of a lock in shape. Asymmetrical design with conical cut outside for less weight. Straight edge 'lock in' inside for control on all terrains.