Several members like 
SSGLordBert have 3D printed neck seals in flexible filament like TPU.
Others like 
marinesniper sculpted and then molded and cast neck seals in flexible rubber.
	
	
		
			
				
			
			
				
				Ok so I wanted to make a neck seal that goes down the chest and down the back a little too hide any gaps so here is what I have give me your honest opinion please
				
					
						
							
						
					
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Others have utilized the Evil Ted pattern:
	
	
		
			
				
			
			
				
				Foam h5 neck seal. Started with Evil Ted Smith's foam neck pattern.
				
					
						
							
						
					
					www.405th.com
				
 
			 
		 
	 
Others custom make their patterns using "Duct Tape Dummy" method:
	
	
		
			
				
			
			
				
				Hey guys! So one thing that my suit has been lacking (and something my next suit will need) is a decent neck seal. I had originally made a sort of tube sock that slipped over my head and covered my neck, but it didn't look all that great, and was a pain when removing or putting on my helmet. I'm...
				
					
						
							
						
					
					www.405th.com
				
 
			 
		 
	 
	
	
		
			
				
			
			
				
				So I find I keep making these one off posts, sharing the different little things I've been working on, and today is no exception. I finished the Version two of my Spartan neck seal! These were inspired by KitKatGoose , and I had made the patterns from there.  So I'll start at the beginning, with...
				
					
						
							
						
					
					www.405th.com
				
 
			 
		 
	 
	
	
		
			
				
			
			
				
				Hey guys! So one thing that my suit has been lacking (and something my next suit will need) is a decent neck seal. I had originally made a sort of tube sock that slipped over my head and covered my neck, but it didn't look all that great, and was a pain when removing or putting on my helmet. I'm...
				
					
						
							
						
					
					www.405th.com
				
 
			 
		 
	 
And an older thread where you can see the pattern used, and might be able to transfer it from the image shown to your own paper.
	
	
		
			
				
			
			
				
				I am no good at sewing, so I decided to try something a bit different for my neck seal.  I bought some 2mm Aero-Mat to use as material since it already has a hex pattern. http://www.acpsales.com/Aero-Mat.html  I used the neck seal pattern from Blue Realm Studios as a template...
				
					
						
							
						
					
					www.405th.com