A garden kneeler can be a loose padded mat or a folding frame that turns over to become a seat. Choose around the jobs you already do near ground level: a pad is the simpler option when you only need a surface to kneel on; a frame adds handles and a seated working position, but needs more room and careful setup.
Start with one familiar job beside an existing border. Note where you put your knees, where the tool goes and how often you move along the edge. Include carrying it back to the shed in your trial.
Decide whether you need a frame
A loose pad has no legs to unfold. You can pick it up and move it to the next patch, though its usable surface still needs to fit the space. A folding kneeler occupies more ground around the cushion. Check whether its side frames would meet a plant, edging or the pot you are tending.
Keep the task specific. In Thrive's equipment survey, gardeners mention kneeling mats for weeding and kneelers alongside hand forks and buckets. These are useful examples of a small working kit; you do not need to buy every accessory pictured with a kneeler.
If your actual job is filling pots on a tabletop, consider an outdoor potting bench instead. A kneeler earns its place beside low planting that already needs tending.
Check the cushion and your working reach
Try the item before buying where possible. Thrive's buying guidance recommends checking equipment weight, grip and balance in your own hands. For a kneeler, take your usual gardening gloves and check that you can grasp the handles properly.
Look at usable cushion width and depth, rather than the frame's overall dimensions. Both knees should fit on the padded area without resting against an exposed rim. Try the seated position separately if you expect to use it. One useful position does not prove that the other suits the same job.
Check how far the border work sits beyond the front edge. A frame that puts you farther from a small weed may be awkward even with a generous cushion. Move the kneeler as you work along the border. Keep the waste bucket nearby without blocking your way out.

Find a suitable place for the whole base
Look at the surface beside the planting before choosing a frame. Can the whole base sit level, with every contact point supported? A paving edge with a drop on one side is a poor place to discover that a leg extends beyond the slab.
The Coopers H071 instructions require a level, flat surface and warn that the seat can topple. They also specify using both handles when rising from kneeling. Follow the handling instructions for your exact model; a padded frame is not a reason to balance on unsuitable ground.
Read the stated user-weight limit before trying it, including any separate limits for its different uses. A similar-looking frame or thicker cushion does not establish the load rating. If the supplier cannot provide the correct instructions, leave the purchase unresolved.
Try unfolding, locking and carrying it
Ask for a demonstration of the folding mechanism. Then check that you can operate it as instructed and identify when both sides are locked. The Garden Gear G0999 manual describes feet that click into place and warns against putting fingers near the springs during use or folding.
Check the empty frame for loose connections, damaged padding or worn ground-contact parts. Ask the supplier about anything that moves unexpectedly. A tool pouch should leave the handles and folding mechanism accessible; check its fitted position rather than assuming it can stay attached in every configuration.

Carry the folded item a short distance before deciding. Include opening the storage door and putting it down again. Measure the folded depth as well as its length: a flat-looking frame can still catch on everything beside it.
Plan its return after a muddy job
Read the material-care instructions before buying. For G0999, the manufacturer specifies a soft cloth with warm soapy water and cool, dry storage. H071's instructions say to dry it before storage and keep it in a dry, frost-free place. Use the directions supplied with your own model.
Reserve an accessible space in your existing garden storage, away from clean cushions. Keep the manual where you can check it again.
For ideas about the planting around that working area, Gardenly's styles can offer visual inspiration. Choose the kneeler's fit, support and stability from the real equipment and its instructions.