the dog funk link doesn't have much of a selection of sizes. Can the Red Frequency helmet you sell have a sound system added to it? I assume this is a separate purchase, from whom? cost?

Tech Specs:

Material:

[Shell] Polycarbonate In-mold; [Liner] closed-cell foam 

Ventilation:

Climacontrol ventilation system 

Adjustability:

Ratchet back, slidelock chin 

Recommended Use:

Snowboarding, skiing 

Manufacturer Warranty:

1 Year