These are gel insoles. Comfort Heelcup. I bought two pairs and kept one pair at home. Please purchase if you understand this. They will be shipped in simple packaging via Yu-Pack Mini. ⭐︎Product Features: Shock Absorption ⭐︎Use: Heel ⭐︎Features: Cushioning, Reusable, Shock Absorption, Height Increase [Reduces heel pain with shock absorption] Made of soft silicone material to absorb shock during walking and running. Reduces strain on the heel and supports discomfort from plantar fasciitis and heel spurs. [Ideal for plantar fasciitis and Achilles tendonitis] Heel pads suitable for preventing and alleviating plantar fasciitis, Achilles tendonitis, heel pain, and blisters. Heel supporters recommended for long hours of standing work and commuting. [Self-adhesive for a comfortable, non-slip fit] Self-adhesive heel insoles that stay firmly in place inside your shoes. Compatible with various shoes such as sneakers, pumps, and leather shoes, providing a discreet and comfortable fit. [Washable and reusable, economical] If they become dirty or lose their adhesiveness, simply wash them lightly with water to restore their stickiness, allowing for repeated use and making them economical. They are also a long-lasting item as shoe insoles. [Natural height increase with heel lifts] Cushioned heel lifts provide a natural height increase. The discreet semi-transparent design makes them perfect for everyday use as secret insoles. (Quoted from product description)