This tag is used to describe the material that a being's outer layer is made of.

There is a set of modifiers for body parts, for when different parts of the body have different surfaces; for plants, treat the body as the trunk or stem, legs as roots, arms as branches, wings as leaves, neck as flower stem, and head as the flower.

Wyrm's site advises that “You can specify most parts of the body with this tag, however you should endeavour to keep the tag short by only showing a few important features. You could have a short tag for e-mail and news posts, and a long one for your Web site.”

• Skb: Bark
• Skc: Cellulose, such as most non-bark plant surfaces
• Ske: Exoskeleton, including shells, calcium carbonate, chitin
• Skf: Feathers
• Skh: Hide; this term has considerable overlap with skin but may imply something thicker and tougher than human skin
• Skk: Skin
• Skl: Leather; presumably not metaphorical, referring to tanned and preserved skin or hide
• Skm: Metal
• Skr: Rock, stone
• Sks: Scales
• Sku: Fur; skin with particularly thick hair
• Skx: Crystals
• Sk: None, just bones

Body-part-specific skin types are separated from the main skin type and from each other by commas.

• ,a<type>: Arms. Sks,ak is “My body is scaly, but I have skin on my arms.”
• ,b<type>: Belly. Sks,bm is “My body is scaly, but I have a metal underside.”
• ,h<type>: Head. Sku,hf is “My body is furry, and I have a head of feathers.”
• ,l<type>: Legs. Skr,lh is “My body is rocky, and I have legs of hide.”
• ,n<type>: Neck. Skb,nc is “My body (trunk) has bark, but my neck (flower stem) is cellulose.”
• ,t<type>: Tail. Sks,th is “My body is scaly, but my tail has hide.”
• ,w<type>: Wings. Sks,wl is “My body is scaly, and I have leathery wings.”