Change sheets before replacing larger bedding.
Wrinkles and corner pop-offs can be a sizing issue.
Use different textures for warm and cool months.
Texture comes first
Crisp, smooth, brushed, stretchy, silky, and matte sheets all feel different. A sheet can be high quality and still wrong for your preferences. If you dislike the texture, thread count or brand claims will not matter much.
Warmth and airflow
Flannel, microfiber, cotton, linen, bamboo-derived fabrics, and blends can all feel different in warm or cool rooms. A sheet that feels cozy in winter may feel too warm in summer. Seasonal rotation is often more useful than searching for one perfect set.
Fit affects comfort
Sheets that are too tight can pull the mattress corners and create tension. Sheets that are too loose can wrinkle, bunch, or slide. Measure mattress depth, include toppers, and check whether the elastic actually grips the corners.
Laundry feel
Detergent amount, drying method, fabric softeners, and storage can change how sheets feel. Overloaded machines may not rinse evenly. Sheets stored before fully dry can feel stale. Keep one reliable set ready so the bed reset is easy.