3.5" Low Profile Steel Box Spring

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If you are looking for a heavy duty support system for yourself along with your mattress than look no further than the semi-flex low profile steel box spring. Semi-Flex Performance Grid is the steel wire foundation that's better than all-wood alternatives because it's stronger, lasts longer, and doesn't squeak or crack like wood does. The welded steel wiring of the foundation allows for a more secure nights sleep.

Eastern King and California King are split into two boxes.

Product Highlights:

  • Cuts down squeaking and creaking by 85% than your normal box spring
  • More durable than your standard wood box spring 
  • Lasts twice as long than a wood box spring 
  • Low profile design that is excellent for tall mattresses
  • Available only in a stylish black fabric 


Twin:  38"W x 75"D x 3.5"H
Twin XL: 38"W x 80"D x 3.5"H 
Full: 54"W x 75"D x 3.5"H 
Queen: 60"W x 80"D x 3.5"H
Eastern King: 76"W x 80"D x 3.5"H 
California King:  72"W x 84"D x 3.5"H

Returns Policy

  • All sales are final after pick up or delivery. Merchandise inspection is the responsibility of the customer to fulfill.
  • Signing upon delivery or pick-up is acceptance of merchandise.
  • Merchandise that is defective must be reported ti a customer service representative at Mission Furniture within 48 hours of delivery or pick up for it to be considered void.
  • Manufacturer delivery dates are estimates and are subject to change or delay.
  • Cancelled items and exchanges are subject to a 30 percent restocking fee.