Special Note: This product is inflatable and does not come with an outer jacket. If it hits sharp objects, it will definitely break. Upon receipt, please immediately check if there are any leaks or damage before using it. If you do not check, our factory will not be responsible for any issues after use. If you are unsure about this, please refrain from placing an order. Thank you.Inflatable Ski Ring 90cm Anti-Rollover Outdoor Children Thickened Ski Ring Cold-Resistant Ski Mat