Based on this product's specifications, here are some alternatives and similar models
Swimming board NMC Comfy Pro KB-XP20 — foam kickboard, blue
Summary description:
NMC Comfy Pro KB-XP20 is a swimming kickboard designed to support swim training and technique work. This foam kickboard (blue) provides buoyancy for leg-focused exercises, drills, and aquatic fitness. Suitable for use in pools, swim lessons, and rehabilitation sessions, it helps isolate lower‑body movement, improve kicking technique, and build leg strength.