Panels can be installed with a U-channel or clips.  Various sizes, from a full length panel to just  knee wall or seat are options.  

panel door
panel door
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Shower Panel Set in U-channel
Shower Panel Set in U-channel
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Shower Panel Set with U-Channel
Shower Panel Set with U-Channel
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Oversized Panel set with U-Channel
Oversized Panel set with U-Channel

Has a Header to support the top

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Panel with bench cut out
Panel with bench cut out
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Side panels in U-channel
Side panels in U-channel
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Panels with clips
Panels with clips
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Panel set in U-channel
Panel set in U-channel
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Full length panel in U-channel
Full length panel in U-channel
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