How to Choose: Armrest and backrest size recommend to choose 28" x 28" or 36" x 36" or 28" x 35". It is recommended to choose 28" width to fit equal to or less than 24", 36" width to fit sofa width between 24" to 32", width is for length, please add extra 4 8" long to tuck in on both sides, wider and longer is better than shorter. For example, your sofa size is 30" x 58", you can order size 36" x 63" (approx. Single Piece Sale: Our sofa cover is made of highquality cotton and polyester fiber fabric, soft and smooth, making your sofa more comfortable and durable. (PIECE Sale, not all sets) Stay in Place: Thick quilted sofa cover is designed with nonslip backing silicone, which is more secure than other ordinary sofa cushions using straps. Please note that minor adjustments are required for rowdy dogs and kids. Easy Care: Easy to clean, machine washable (cold water) and dryable (cool), do not bleach. Multifunction & Application: Protect your sofa, couch, loveseat, recliner and chairs from pets, spills and stains. This sofa cover is suitable for all seasons, not only for sofa cover, but also for baby play mat, bedroom rug, floor mat, window bench mat, etc.