Shoreline Spas SL630L-18-4 SL630L Hot Tub Sterling Silver Int/Gray Ext w/ in.Touch: Step outside your fast-paced life and into the soothing, effervescent waters of your new Shoreline Spa. With ample room and first-class amenities, the In Touch Spa will bring a sense of beauty to your backyard and a sense of serenity to your life. Built to last and designed for comfort.