water can slowly seep into the pores, which can eventually increase the pumice's density and cause it to sink. However, this process can take a long time depending on the size and composition of the pumice.
• 1.5" foam headband holds shield away from face; "floats"lightly on forehead, with no pressure on temples; vented for increased air flow. • Protects mask and face from direct splatter; may prolong mask life. • Sonically welded elastic headband for added strength. • Anti-fog ...