Wave Builder Wave Cap. Wavebuilder wave cap is your complete hairstyle solution. For maximum wave-making potential, the key to great waves is training. Wavebuilder cap 2-count will help you change up your look. Breathable, cool and comfortable premium construction for maximum compression and wave making power. | Stays tight all night with form fitting design. | Promotes healthy and uniform waves with regular use. | This high quality, safe, effective WAVEBUILDER product is made by us with only the best available materials.