BREATHABLE COOL 3D MESH: Breathable sequential 3D-mesh construction keeps cool air in the summer and warm air in the winter. 3D Mesh is consturcted with series of pillars between the top and bottom layer of the seat pad creating space where air can circulate easily and provide soft cushion at the same time.PREMIUM MATERIAL ONLY FOR BABIES: Tricot mesh provides smoother surface for baby's sensitive skin while keeping the seat pad breathable. 3D Mesh has greater air-flow than bamboo, ramie or air-mesh.CONVENIENT TO USE: It's size is large enough to use from small to large strollers and car seats. It is very light weight and easy to install. Dual side construction composed of 3D-Mesh can be used on either side.100% HAND MADE: The liners are handmade using authentic 3D mesh tools. The liners are 100% polyester and then the fabrication and weaving creates the 3D mesh. You can see small holes in the material, any comparable products that do not have the holes are not true 3D mesh and do not provide comparable cooling effects.