Этот чехол мягкий, и с ним телефон не скользит в руке.

Чехол means case or cover — in this sentence, a phone case.

It is a masculine noun, so it matches этот and мягкий:

• этот чехол = this case
• мягкий чехол = a soft case

Because чехол is masculine.

In Russian, demonstratives must agree with the noun in gender, number, and case:

• этот = masculine singular
• эта = feminine singular
• это = neuter singular
• эти = plural

So:

• этот чехол = this case
• but эта сумка = this bag

Мягкий is the normal long-form adjective in the masculine singular nominative, agreeing with чехол.

Russian often uses the long form even after to be is omitted:

• Чехол мягкий = The case is soft

About the other forms:

• мягко is usually an adverb: softly
• мягок is a short-form adjective, which is possible in some styles, but much less common here

So Этот чехол мягкий is the most natural everyday wording.

Ним is the instrumental case form of он / оно after the preposition с.

The preposition с meaning with normally takes the instrumental:

• с другом = with a friend
• с чехлом = with a case
• с ним = with him / with it

Here ним refers to чехол.

After many prepositions, the third-person pronouns get an extra н-:

• у него
• к ней
• с ним
• о них

Without a preposition, you get forms like:

• его
• ему
• им
• их

So:

• им = by him / by it
• с ним = with him / with it

This n-insertion is a very common pattern in Russian.

Yes, literally it means with it, referring to the case.

In Russian, this is very natural. The idea is:

• when using it
• with it on
• with this case

So с ним телефон не скользит в руке means something like:

• with it, the phone doesn’t slip in your hand
• when the phone has this case on, it doesn’t slip in your hand

English often avoids with it in this kind of sentence, but Russian uses it comfortably.

Because телефон is the subject of не скользит.

The second clause is:

• телефон не скользит = the phone does not slip

So:

• телефон = subject, nominative
• не скользит = verb

Even though the case is being talked about in с ним, the phone is still the thing performing the action of not slipping.

Скользить means to slip, to slide, or to be slippery in the hand, depending on context.

Here телефон не скользит в руке means:

• the phone doesn’t slip in your hand
• the phone isn’t slick/slippery to hold

This is a very natural verb here because the sentence describes what happens when you hold the phone.

В руке means in the hand — singular.

That is natural when talking about how an object feels while being held, especially in a general sense. Russian often uses the singular in cases where English might also say in the hand or in your hand.

• в руке = in the hand / in one’s hand
• в руках = in the hands / in one’s hands

Both can be possible in different contexts, but в руке works very well here because it focuses on grip and how the phone feels when held.

Because this sentence has two clauses:

1. Этот чехол мягкий
2. с ним телефон не скользит в руке

They are joined by и = and, and in Russian, a comma is normally used between two independent clauses.

So the comma is completely standard here.

Yes. Russian word order is flexible.

The original sentence:

• Этот чехол мягкий, и с ним телефон не скользит в руке.

Possible variants include:

• Этот чехол мягкий, и телефон с ним не скользит в руке.
• С ним телефон не скользит в руке.
• Телефон с ним не скользит в руке.

The meaning stays similar, but the emphasis changes:

• с ним first emphasizes the case
• телефон earlier can emphasize the phone

The original version sounds natural and clear.

Yes, but the meaning would shift slightly.

• телефон не скользит в руке = the phone doesn’t slip in the hand
• телефон нескользкий = the phone is non-slippery / not slippery

The sentence with не скользит is more dynamic and practical: it describes what happens during use. That is often more natural in product descriptions or everyday comments.

So the original sentence sounds very idiomatic.

Both ideas are present.

• Этот чехол мягкий gives one property of the case: it is soft.
• с ним телефон не скользит в руке gives a practical result: the phone is easier to hold and does not slip.

So the sentence is not just describing texture; it is also implying that the soft case improves grip.