It does not*. They’re very sleek and firm. They do feel ‘bigger’ than the same circumference in silicone, as there’s no squish, but you can factor that in when you’re browsing. 
Here’s the Glass Dildo Guide if you want to have a read. 
But silicone is great too. Mrs Chimp tends towards glass for dildos, but has plenty of silicone rabbits, g-spot toys, etc.
Here’s our collection if you fancy a browse?
*Mrs Chimp vouches. I have not inserted one in myself.