July 10, 2026
Iron Heart 14oz “Ultra-Heavyweight” Loopwheeled Crew Neck Sweatshirt
“Ultra-Heavyweight Champion!”
This 14oz loopwheel sweatshirt is one of Iron Heart's signature pieces. The fabric is slowly knitted on vintage loopwheel machines in Wakayama, Japan, giving it a smooth hand feel with a subtle vertical texture on the surface. The interior is carefully brushed for exceptional softness, feeling as luxurious as the finest cashmere. The yarns are reactive-dyed, and with time and wear, the sweatshirt will gradually develop a beautifully vintage character.
Construction-wise, we love the classic V-inserted collar, along with the durable ribbing on the crew neck, cuffs, and hem. The sweatshirt is also constructed entirely with flatlock seams, helping it retain its shape even after years of wear.

