To comma, or not to comma before "even"

Yes, put a comma there.

But even with the comma, what you have is neither grammatical nor logical.

Paulius PetkeviciusI was wondering if it is necessary to use a comma before the word "even" in this sentence. (before word "even")?

Paulius Petkevicius"Gentlemen's accessories to help stay smooth in all situations even fighting bears."

That text is not a sentence. It is also ungrammatical and

Thanks for the corrections.

It is about selling accessories for men (gentlemen) to help them be smooth in all situations, including fighting bears.

Smooth is being used as an adjective to describe something being done easily, with no hustle, effortless (even if in reality it does take a lot of effort, hence fighting bears).

Does my explanation makes sense?

Paulius Petkeviciusto help them be smooth in all situations

That is not natural English.
What accessory would be used to fight bears? A tranquilizer gun, pepper spray?

A knife for example.

Not natural - does it mean it is incorrect or it just sounds unnatural but it can be used?
How would you phrase it to sound natural?

Paulius PetkeviciusGentlemen's accessories to help stay smooth in all situations even fighting bears.

Gentlemen's accessories to keep you cool in all situations—even fighting bears.

We use "cool", not "smooth", when we refer to maintaining one's composure and not panicking. "cool" has the added meaning of "fashionable", so I think it's a good choice.

CalifJimto keep you cool in all situations

But that is not the meaning that Paulius wanted: being done easily, with no hustle, effortless.
These might be closer:
Gentlemen's accessories to keep you relaxed in all situations—even fighting bears.
Gentlemen's accessories to keep you impregnable in all situations—even fighting bears.

AlpheccaStarsBut that is not the meaning that Paulius wanted

Hmm. Then maybe he should be wanting something else!

CalifJimHmm. Then maybe he should be wanting something else!

I suppose it depends on the nature of those "accessories."

Yes, it is more of advertising line/slogan.

I assume saying "Gentlemen's accessories and tools..." would be better?

AlpheccaStars but do you think that these options sound good for advertisement line or slogan? "Self-assured" is closest to the meaning of what I wanted.