A sheet material is disclosed including inherently flame-retardant fibres entangled with tanned collagen fibres. The tanned collagen fibres may be natural tanned collagen fibres derived from animal leather. Also disclosed is a process for producing a sheet material, the process comprising providing tanned collagen fibres, providing inherently flame- retardant fibres, and entangling the tanned collagen fibres and flame-retardant fibres to form a fibre mixture. Optionally, a binder may be added, and the sheet material may be embossed. The process may further comprise providing one or more tanned leather pieces and defibrillating the tanned leather pieces to form the tanned collagen fibres. Entangling the tanned collagen fibres and flame-retardant fibres may be by spun-lacing, hydroentanglement, or air entanglement.
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