These are Monster Jam Swim Trunks! Monster Jam is the ultimate pit stop for watching these greatly engineered vehicles roar in your local stadium, performing near-impossible feats at breakneck speeds. At Monster Jam, legends have been made over the years as these trucks compete in races and other freestyles to find out who truly is the best. These comfortable water swimming trunks feature mesh netting inside the shorts and an elastic stretch waistband for a more inclusive size range. The shorts themselves are made of a comfortable 100% polyester fabric blend.