| Step 1. | 
                  
                   Choose Home tab→Solids group→Add list→Thicken. 
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| Step 2. | 
                  
                   Select the faces you want to offset to construct the thicken feature.  | 
            |
| Step 3. | 
                  
                   On the command bar, type or select an offset distance.  | 
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| Step 4. | 
                  
                   Click the arrow to define the side to which you want to offset the faces.  | 
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| Step 5. | 
                  
                   On the Thicken command bar, click Finish.  | 
            
Tip:
Set the Select option on the Thicken command bar to Feature to select a stitched surface in one step.