Zentai are full-body suits, typically made of spandex or similar stretchy materials, that cover the entire body including face. The term comes from Japanese "zenshin taitsu" (full-body tights).
The appeal includes the sensation of full-body compression, the visual anonymity and transformation, the sleek aesthetic of covered form, or the psychological effects of being fully enclosed. Some find the sensory experience meditative.
Zentai relates to broader catsuit/bodysuit fetishism, enclosure interests, and transformation kinks. Colors, materials, and specific designs vary based on preferences. Some include attached hoods while others are separate.
Different materials create different experiences - from thin spandex to thicker materials providing more compression. Proper fit is important both for comfort and achieving desired aesthetics.