Edward Rivet is dressed in a firefighter costume while playing on his new swing set.

HAVERHILL -- Edward Rivet might just be the coolest kid on the block with a new swing set, rock wall, wooden fort and a 10-foot slide.

Not only are local volunteers building the jungle gym for him, but the $1,800 bill for the playset is already paid off.

Based out of Virginia, the Roc Solid Foundation crosses the country with a difficult task: build 30 playsets in three days. It marks the third year of Roc Solid's "Play Defeats Cancer Tour." The non-profit has purchased and distributed thousands of playsets to children fighting cancer since its founding in 2009.

Pediatric cancer can affect a kid's ability to play as their weakened immune system requires a germ-free setting. Returning to the playground builds the child's hope and the family's strength, according to Roc Solid's Director of Marketing Ashley Martin.

One of those 30 families happens to be Haverhill residents -- The Rivets.

Edward Rivet is fighting a pilocytic astrocytoma, a brain tumor that is found most commonly in children. Many receive surgery to remove the tumor with 94.6% of patients surviving 10 years after full removal.

Edward's mother, Caitlin Rivet, became his foster parent when he was six months old.

Caitlin Rivet is a single mother and the director of Clinical Operations at New England Neurological Associates. She became concerned about Edward's health after he'd spat up baby formula. Not long after turning a year old, Edward was diagnosed with cancer and began chemotherapy.

"He did well," Caitlin Rivet said.

The doctors were surprised by his toughness at such a young age. His condition is an ongoing back-and-forth battle, according to Rivet.

Rivet adopted Edward about three years later.

At 7, Edward Rivet loves Iron Man, Captain America, and most importantly, firefighters. With a new playset, Rivet has a firehouse to store his toy fire trucks. He's already labeled the upper layer of the playset his "lookout tower" where he'll search for burns, according to Caitlin Rivet.

Roc Solid's crews arrived at the Rivet residence at 9 a.m. Wednesday. Amazon employees worked alongside the non-profit, constructing the playset piece by piece.

Amazon sponsors Roc Solid's "Play Defeats Cancer Tour." Local employees volunteered for the Rivet's build.

"The volunteers have really high spirits," said Development Coordinator Jessica Kantor, "Everyone's been in an amazing mood and ready to build hope."

Good vibes flowed through the Rivet's backyard as volunteers put hammers to nails and Edward stared in awe at the crew's creation.