ISM PR 4.0 Saddle

The ISM PR 4.0 Saddle is a completely redesigned model engineered to deliver elevated comfort and support for long-distance cyclists. As the widest performance saddle in the ISM lineup at 150 mm across, it provides an expanded rear platform that optimizes sit bone weight distribution and reduces targeted pressure points.

Built with premium 60-series foam and plush gel padding, the PR 4.0 offers a soft yet structured ride whether you are wearing technical cycling bibs or casual clothing. True to ISM's health-first engineering, the signature noseless design paired with a full-length central relief channel completely removes pressure from the perineum and sensitive tissues. This promotes healthy, unrestricted blood flow and eliminates numbness, making it the ultimate choice for endurance road, gravel, commuting, and indoor exercise bike setups.

Highlights

•    60-Series Foam & Gel Cushioning: Dual-density foam and gel padding offer superior dampening and plush comfort over long miles.

•    Widest 150mm Rear Profile: Extra width across the sit bone area maximizes weight distribution and relieves lower back/hip strain.

•    Noseless Design & Full Central Relief: Completely removes pressure from soft tissues and the perineum, preventing genital numbness.

•    Endurance & All-Road Versatility: Built for long-distance road riding, gravel exploration, daily commuting, and indoor spin bikes.

Specifications