Harley Ingleby Series in Carlsbad operates the U.S. distribution and showroom facility for the performance longboard line designed by two-time WSL World Longboard Champion Harley Ingleby and shaped by Billy Tolhurst, who has been building surfboards since 1964. The boards are constructed using Thunderbolt Technologies' Japanese EPS-core and carbon-fiber layup process, a construction method tested in the powerful reef breaks along South Carlsbad State Beach and points south. The Cosmos Court showroom stocks the full model range including the Mid6 mid-length, the Moe performance cruiser, the Diamond drive-oriented longboard, and the HI BT 3+3 featuring a patented three-plus-three fin-plug system that converts between thruster, twin, and asymmetric configurations. Carlsbad's year-round swell window from Tamarack south through the Ponto reef at North Ponto Beach provides the testing ground for each new model iteration. The Thunderbolt Red construction pairs hand-laid fiberglass with targeted carbon-fiber reinforcement over a CNC-milled EPS core, producing boards 20 to 30 percent lighter than traditional polyester-resin longboards at equivalent volume.