Artist globally use EPS Foam as fill and initial shaping for their sculptures.
Used by Disney studios in the USA, high density expanded polystyrene EPS foam blocks are ideal for creating large lightweight sculptures. Glue
Sculpting Foam Blocks
SILVERLAKELLC Silverlake Craft Foam Block - 3 Pack of 8x12x2 EPS Polystyrene Blocks for Crafting, Modeling, Art Projects and Floral Arrangements - Sculpting Sheets for DIY School & Home Art Projects
AMZQNART Craft Foam Blocks, 1 in Thick 17x11 EPS Polystyrene Rectangle Foam Blocks Packs of 7 Pcs for Art Sculpting, Sculpture, Modeling, School
IN STORE PICK UP ONLY!!, As a lightweight closed cell foam, EPS (expanded polystyrene, aka Styrofoam, Beadboard) is very popular for countless crafts
STYRENE LARGE SHEETS/BLOCKS
10 Best Styrofoam Blocks Review - The Jerusalem Post
Polystyrene Carving Blocks. MDF grade polystyrene blocks.
300x300x200mm Carving Foam medium density EPS Foam blocks. Start a new Hobby
AMZQNART Craft Foam Blocks, 7 in Thick 17x11 EPS Polystyrene Rectangle Foam Blocks Packs of 1 pcs for Art Sculpting, Sculpture, Modeling, School and Home DIY. : Arts, Crafts & Sewing
Craft Foam Block EPS Polystyrene Sheet for Crafting Modeling Floral Arrangements Sculpting Panels DIY Art Projects 30x35x3cm - AliExpress
Movie Prop Maker: Set Sculpture terminology (EPS Foam Carving)