We're pleased to offer these high quality, fully-lined weighted vests that feature velcro closures, sealed sandbag weights, and four discreet inside pockets that are designed to accommodate a variety of different size weights. These stylish vests are made of rugged denim and have neat, unisex-design linings. They are available in six childrens' sizes -- X-Small (size 2-3 w/4-4oz. weights), Small (size 4-5 w/4-4oz. weights), Medium (size 6-8 w/4-6oz. weights), Large (size 10-12 w/4-8oz. weights), X-Large (size 14-16 w/4-8oz. weights) and XX-Large (size 18-20 w/4-8oz. weights). Weighted vests generally are incredibly effective for providing proprioceptive input; typically having a calming, organizing effect for many children. Extra weights are sold separately.