Unlike high-bitrate 4K rips that require fiber internet, Filmy4Wap targeted the mobile-first user in South Asia. Their compression technology (often using HEVC codecs) allowed a 2-hour movie to be squeezed into 300MB. The "Skin" in the keyword likely refers to a modified interface or a specific version of the website that allowed users to switch visual themes (or "skins") to avoid ISP blocks.
Filmy4wap.skin is known for providing exclusive content, including: filmy4wapskin exclusive