Burgon & Ball

https://www.burgonandball.com/collections/kneelers-and-knee-pads

Perfect for saving joints – and clothes! – if you need to garden at ground level in comfort. The beautiful botanical design of our Brie Harrison kneeler takes the lush leafiness of houseplants outdoors, or for the last word in comfort, our Kneelo® gardening kneelers and knee pads are the most comfortable you’ll ever try!
The secret to Kneelo’s perfectly cushioned design is a central core of shock-absorbing EVA foam sandwiched between two layers of memory foam. This unique memory foam technology allows you to work in comfort for longer.

Agriframes

https://www.agriframes.co.uk/bosneeleze

The BosNeeleze Garden Kneeler has been designed for your comfort - made from eva foam covered in neoprene fabric, it can be used in the home and garden and in all weathers. The BosNeeleze Garden Kneeler is waterproof and suitable for all surfaces. It is easy to care for and can be wiped clean and left to dry.

Designed to be used in home and garden and is available in 5 colours.

Greenfingers

https://greenfingers.com/Search.aspx?search_text=kneeling%20pads

Give yourself that extra bit of comfort when kneeling in your garden or home with this Garden Kneeling Pad. It will keep your knees clean and dry and features a handy carry handle for easy storage.
Made from lightweight foam, it is easy to wipe clean.

A great garden must-have at a fantastic value price!