Found: Rinsten Spring, to soften bumps in the road before they get to the saddle - Bikerumor
Planet Bike 5004 Cruiser Web-Spring Saddle – The Bikesmiths
Rinsten Spring Bike Seat Suspension Review - YouTube
Amazon.com : UNISTRENGH Vintage Bike Saddle Bike Seat Leather City Bike Saddle Spring-Loaded Touring Saddle Spring Saddle with Upgrade 4 Springs, with Clamp and Rivet (Black) : Sports & Outdoors
Schwinn Eco Comfort Spring Suspension Bike Seat Lime Green Bike Saddle – Random Bike Parts
Zacro Gel Bike Saddle - BS053 Dual Spring Designed Suspension Artifici – Pete's Sports & Outdoors
Bicycle Saddle Spring Shock Absorber Suitable for MTB Mountain Bike Universal Comfortable Suspension Device Cushion Accessories - AliExpress
Cloud 9 Web Spring Comfort | E-Bikes of Holmes County LLC
A Springy "New" Take On A 100 Year Old Bike Problem - Core77
Planet Bike ARS Spring Saddle - Women's - The Spoke Easy | Charlotte, NC
Cruiser wb spring saddle Cloud 9 - Spokesman Cycles
Cruiser Web Spring bike seat - Planet Bike
Planet Bike Comfort Web Spring Saddle - Women's - Mr C's Bicycles | Surfside Beach, SC
What Kind of Bicycle Seat Spring Do You Need? - Bike Seat with Springs Explanation - YouTube
Review: Rinsten Spring isn't a pain in the butt
Mesh Top Leather Dual Spring Seat / Saddle - JupiterBike