Here's a Copper Knight Helmet I made using craft foam : r/cosplayprops
Evil Ted Live: Making a Foam Knight helmet - YouTube
Amazon.com: Liontouch Noble Knight Helmet, Blue | Medieval Pretend Play Toy in Foam for Children with Golden Lion Theme | Battle Armor for Dress Up & Costumes for Kids & Toddlers :
DIY Elite Knight Helmet Templates for EVA Foam & Crafting Help Book - Etsy
Foam Black Knight Costume Helmet | Medieval Accessories
Free Templates — Ashen Warrior Props
I am Sunlight Cosplay and this is my handmade Souls series helmet collection. Made from EVA foam and hand painted! : r/gaming