SP100-ADS Adjustable Seatpost

This seatpost from Mighty is one of the few on the market that let you adjust the height while riding!  A QR lever attached to your handlebar makes this an easy adjustment.  Three level are available: 100, 55, and 0 mm.
Quick release height adjustment while riding
445 mm in length
Three height steps: 100/55/0 mm
For bikes with a 31.6  mm seat tube
On header card