Dorbin has put into place extreme price increases and their material has become exceptionally expense and strongly urge you to consider Reese or Pemko as alternates.
Dorbin 139BN Oil Rubbed Bronze 40" Door Sweep with Sponge Neoprene Insert - 3/16"W x 1-1/2"H
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as it will prove more flexible in extreme temperatures when compared to neoprene. More about Polyurethane can be reviewed on page: here:
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But this automatic door bottom might be worth a closer look as well:
the bristles will too proce forgiving on your sill condition.
Is there a follow up question that we can perhaps attempt to answer? We take pride in our technical expertise, as we know it separates us from our competition, so don't hesitate to ask.
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if we can assist you by answering further questions or with entering this order and please let us know if there is anything else we can help with.