Maybe one of these similar products would be of interest:-

Rowing-Machine Cover Dustproof-Waterproof Water Rowing-Machine Cover For Concept

Memory Foam Rowing Machine Seat Cushion for Long Workouts For Concept 2

Rowing Machine Cover Dustproof Waterproof Water Rowing Machine Cover for Concept

Oxford Fabric Rowing Machine Cover Compatible with For Concept 2 95 x24 For

Dustproof For Concept 2 Rowing Machine Cover Tear Resistant Material 95 Inches