ensure that the horizontal stiffness does not hinder the curtain 39 s ability to retract vertically from the position of fig5 to that of fig6 foam panel 34 includes a series of compressed indentations 36 or bending creases that render panel 34 more flexible about a horizontal axis than about a vertical axis indentations 36 can be created or formed by sewing panel 34 to a pliable cover 38 in which the sewing process produces a plurality of stitches 40 that holds the indentations in compression other methods of producing compressed indentations 36 include but are not limited to localized ultrasonic or heat sealing of cover 38 to foam panel 34 or localized ultrasonic or heat sealing of foam panel 34 to itself regardless of how indentations 36 are formed maintaining foam panel 34 as a unitary piece as opposed to a plurality of segments simplifies manufacturability and provides a neat clean appearance the assembly of dock apparatus 10 is perhaps best understood with reference to fig2 and 5 side pads 26 can be attached to wall 18 using any suitable means including but not limited to methods that are well known to those of ordinary skill in the art to support foam panel 34 curtain 22 and an upper sheet 42 extending from curtain 22 the head curtain assembly 20 of the illustrated example includes a resiliently crushable support panel 44 atop side pads 26 in some examples support panel 44 comprises a semi.