Gamebreaker Stealth Helmet Liner

| Pros | Cons | 
|---|
| No bulging when sewn in | Requires sewing or adhesive | 
| Could achieve near-full coverage |  | 
Idea: The Gamebreaker Stealth Liner made from D3O could be sewn into or adhered inside any hat, wetsuit hood or squid lid, providing a little protection with little to no hit on surfing performance or looks.
2nd Skull Protective Skull Cap

| Pros | Cons | 
|---|
| Ready to go | Bulges and moves easily | 
| Very light, minimal |  | 
Recommendation: Works great under a tight-fitting wetsuit hood. Otherwise, it will move and bulge easily. Might be better to place under a tight squid lid or 
indo-style hat. Or even under the 
DMC Soft Surf Helmet for a little more protection. There's also a 
pro version with a slip surface for better rotational protection under hard-shell helmets.