Protect your 21-foot round above ground pool with POOLHACKER Heavy-Duty Cover. The 550D Oxford fabric resists tears and fraying from wind, rain, and sun. The steel cable and pulley system gives you a tight, even fit around the entire pool. Pull once to lock it down. Even on windy days, the cover stays flat and secure. The thick material blocks leaves, twigs, dust, and rainwater. UV coating slows fading. This cover is made to handle multiple seasons of outdoor use. Setup is quick. One person can do it without tools. The pulley system makes tightening easy. Press the release tab to remove the cover. Deep side drop provides extra coverage around the pool frame. This helps keep debris from getting under the cover. Fits 21-foot round above ground pools. Check your pool size before ordering. This cover is for 21FT round pools only. | Poolhacker | | 21FT Round Pool Cover for Above Ground Pools,Heavy-Duty 550D Oxford Fabric with Steel Cable & Pulley System,UV Resistant | Oxford Black | Best Buy