Zac Efron and his brother Dylan Efron are soaking up the summer sun.

The siblings recently spent the day splashing in a lake and posted the shirtless pictures to commemorate the moment.

In a captionless Instagram post shared Tuesday, July 1, the High School Musical star, 37, began his carousel with a skin-baring photo of himself sitting behind the wheel of a boat on a sunny day. 

Though he was not facing the camera in the first picture, Zac followed it up with a full-body upload of himself wakesurfing on the water.

Another image taken from a distance showed him walking solo with a blue towel wrapped around his waist, as well as a shot of him and his younger brother sitting on a dock together.

The post ended with a sweet sunset video of the siblings enjoying brotherly time on the boat, trading and trying on cowboy hats.

Dylan, 33, shared his recap the day before.

“Describe summer in one word,” was written over a video that the Traitors star posted to Instagram on Monday, June 30, set to Briscoe’s “Easy Does It.” For his caption, he simply answered with “This.”

In the footage, the brothers took turns leaping into the water from a dock while wearing just swimming trunks, presumably from Vuori, as Dylan made sure to mention the brand in a hashtag in his caption and tag in the video.

They appeared to be joined by Dylan’s longtime girlfriend, Courtney King, who Dylan playfully tossed in the water. The pair were high school sweethearts and have been romantically linked since at least October 2016. 

In between jumps, Dylan and Zac also relaxed by lying out in the sun.

When the brothers aren’t spending time together at lakes, you can likely find Dylan near the ocean. 

During an April episode of Brooke & Connor Make a Podcast, the reality star revealed that on his first visit to Miami's South Beach, he and his friends saved several girls from drowning.

Remaining modest about his heroic feat, Dylan laughed as he told the podcast hosts that the situation “was really random.”

“[I] walk up to the shore for the first time ever, and I’m looking out and it was just people screaming in the water,” he said.

He admitted that he didn’t think the commotion was because of a shark, noting “the currents were ripping,” making swimming much more difficult.

“So, I just saw like five girls. Like their hands were up, screaming, there’s people on the shore with their hands up,” Dylan recalled, adding that he, his “buddy Brandon and Sam Asghari” leapt into action because they didn’t see any lifeguards around to help.

Once everyone was out of the water, he remembered “hugging this girl on shore” and telling her she was safe before he “just walked away.”

“First 10 seconds on this beach and there’s a rescue, like, Miami’s weird,” he said of the experience. “Then we just walked away like normal.”