The special fleece for pools provides reliable protection for pools and pool liners and significantly extends the service life of the liner. It is laid underneath the pool liner and protects it from damage caused by the ground, such as unevenness or small stones. The dimensionally stable swimming pool fleece is easy to roll out and lay neatly. It is suitable for use under almost all commercially available pool liners and is particularly often used for lining eco-pools before the liner is laid. With dimensions of approx. 50 × 1.50 m, a nominal thickness of 4.20 mm, and a weight of approx. 500 g/m², it provides a stable, resistant base. The material is rot-proof and designed for long-term use in pool areas. The special fleece provides additional comfort, reliably protects the pool liner, and supports long-term, safe, and high-quality pool lining.