An eggcrate shelter, which is open to the sky but substantial enough to give the feeling of protection, may be your answer.
At an average follow-up of 4 years, 2 of 10 cases had to be converted to tibiotalocalcaneal arthrodesis because of persistent pain with substantial arthrofibrosis, but not loosening.
A loyal friend is hard to come by. Somehow he came by a substantial fortune.
Meaning of substantial for the defined word.
Grammatically, this word "substantial" is an adjective. It's also a noun, more specifically, a countable noun.