An oven mitt can be thick and still be awkward to use. If you cannot bend your fingers around a small handle or feel where the edge of a tray is, thickness alone is not helping. Compare protection and grip together, using the manufacturer's stated limits as the starting point.
Think about the oven's opening and the dishes you remove from it. A narrow countertop oven may leave little room around a tray. A larger casserole can need two secure grips. The mitt should suit both the space and the cookware rather than only looking comfortable on an empty hand.
Fit changes control
A mitt that is much too large can slide around as you lift. One that is tight may make it difficult to close your hand fully. If several people share the kitchen, one size may not work equally well for everyone.
Check how far the protection extends beyond the hand. The right coverage depends on the reaching task, but exposed skin should not be positioned where it is likely to brush a hot rack or oven edge. Arrange the oven and clear the landing area before lifting anything.
Some products combine fabric with silicone or another textured surface. Look at the seams, grip area and flexibility, not just the exterior material. Read whether the product is intended for dry heat, contact with hot cookware or another specific use. Do not assume it is suitable for direct flame or immersion.
Keep protection dry and in good condition
Use dry mitts or holders as directed. Wet fabric can transfer heat in ways that make handling unsafe. If a mitt becomes soaked while washing up, set it aside to dry fully rather than grabbing it for the next hot pan.
Inspect worn areas, holes and separated seams. Damage near the gripping surface deserves attention even if the rest looks fine. Wash according to the label, and make sure any filling or layered material dries properly before storage.
A pair should be easy to reach without hanging close to a burner. Keep it separate from towels used for dishes so someone does not confuse the two during a busy moment. The goal is a repeatable, secure grip, not the highest temperature number printed in the largest type.