My boy's new swim trunks

I lost my boy's swim trunks last summer so I need to buy a new one for him instead of him using his typical home shorts. A swim trunks will make him feel comfortable while swimming. While scouting for the replacement of his swim trunks, I already have in mind that I will look for something with a tie or string to have it fit on his waist and avoid it from going down when wet. Inside Robinson's Department Store, there are items of swim wear on sale for the summer season. I check the swim trunks for kids one buy one and I found this SnS printed blue swim trunks for my boy. He is turning 5 this April 18 and we will have a swimming party for him at Splash Island. The fabric is soft and well-knitted. When my boy saw it he got excited for his party especially the swimming portion. He loves to swim and slide a lot so I know he will have a great day on his special day with his new swim trunks. It also has strings that I am looking for, a garterized waist and the prints make it more attractive to him.