בחורף אני לובשת מגפיים, ובקיץ אני מעדיפה סנדלים נוחים יותר.

Because the speaker is female.

In Hebrew, present-tense verb forms agree with the subject’s gender and number.
So:

• אני לובשת = I wear / I am wearing (said by a woman)
• אני מעדיפה = I prefer (said by a woman)

If the speaker were male, it would be:

• אני לובש
• אני מעדיף

This is one of the big differences from English: in Hebrew, even I-sentences often show gender.

They mean in winter / in the winter and in summer / in the summer.

The prefix ב־ means in, at, or during, depending on context.
So:

• בחורף = in (the) winter
• בקיץ = in (the) summer

With seasons, Hebrew often uses this kind of phrasing where English would say either in winter or in the winter, depending on style and context.

Because in Hebrew, the preposition ב־ and the definite article ה־ combine.

So underneath the surface, you can think of it like this:

• ב + החורף → בחורף
• ב + הקיץ → בקיץ

In pointed Hebrew, this contraction is clearer, but in normal unpointed writing you just see the combined form.

So בחורף can correspond to in the winter, and בקיץ to in the summer.

It does not have to be repeated, but repeating it is very natural.

The sentence is:

• בחורף אני לובשת מגפיים, ובקיץ אני מעדיפה סנדלים נוחים יותר.

You could also say:

• בחורף אני לובשת מגפיים, ובקיץ מעדיפה סנדלים נוחים יותר.

That would still be understandable, but repeating אני makes the sentence clearer, smoother, and more balanced.

Hebrew often repeats pronouns in coordinated clauses even when they are not strictly necessary.

Good question. ללבוש / לובשת is the general verb to wear / put on, and it can be used broadly for clothing.

However, with footwear, Hebrew often uses the more specific verb:

• לנעול / נועלת = to wear / put on shoes, boots, sandals

So a very natural alternative would be:

• בחורף אני נועלת מגפיים

That may sound more precise to native speakers.
Still, לובשת מגפיים is understandable and not strange in many contexts, especially for learners or in less formal usage.

מעדיפה means prefer.

So:

• אני מעדיפה סנדלים = I prefer sandals

It comes from the verb להעדיף = to prefer.

Hebrew often uses this verb where English might say:

• I prefer...
• I like ... better
• I’d rather wear...

If the speaker were male, it would be מעדיף.

Because Hebrew does not normally use a present-tense form of to be in sentences like this.

English says:

• I am wearing boots
• I prefer sandals

Hebrew just says:

• אני לובשת מגפיים
• אני מעדיפה סנדלים

The present-tense verb form itself carries the meaning, so there is no separate am/is/are.

Also, Hebrew present forms like לובשת can mean either:

• I wear
• I am wearing

The exact meaning depends on context.

Because את is used before a definite direct object, and these nouns are indefinite here.

Compare:

• אני לובשת מגפיים = I wear boots / I’m wearing boots
• אני לובשת את המגפיים = I wear the boots / I’m wearing the boots

And:

• אני מעדיפה סנדלים = I prefer sandals
• אני מעדיפה את הסנדלים = I prefer the sandals

So in your sentence, מגפיים and סנדלים mean boots and sandals in a general sense, not the boots or the sandals.

Because in Hebrew, adjectives usually come after the noun they describe.

So:

• סנדלים נוחים = comfortable sandals
• literally: sandals comfortable

This is the normal Hebrew word order for noun + adjective.

Then יותר adds the comparative meaning:

• נוחים יותר = more comfortable

So the whole phrase means:

• סנדלים נוחים יותר = more comfortable sandals

In Modern Hebrew, סנדל is usually treated as a masculine noun.

So:

• singular masculine: סנדל נוח = a comfortable sandal
• plural masculine: סנדלים נוחים = comfortable sandals

That is why the adjective is נוחים and not נוחות.

This can feel surprising to English speakers because grammatical gender in Hebrew does not always match intuition.

Hebrew usually forms the comparative with יותר = more.

So:

• נוח = comfortable
• נוחים = comfortable (masculine plural)
• נוחים יותר = more comfortable

Unlike English, Hebrew does not usually add something like -er to the adjective.
Instead, it commonly uses:

• adjective + יותר

Examples:

• גדול יותר = bigger
• יפה יותר = more beautiful
• נוחים יותר = more comfortable

מגפיים is the plural/dual-looking form of מגף = boot.

Hebrew has a common ending ־יים, especially for things that come in pairs, such as body parts or items typically used as a pair. So מגפיים means boots.

Related examples:

• נעליים = shoes
• גרביים = socks
• מכנסיים = pants/trousers

Even though the ending historically relates to the dual, in Modern Hebrew many such words are just learned as normal vocabulary items.

Yes. In fact, that is probably the most natural reading.

• בחורף אני לובשת מגפיים usually means In winter I wear boots
• ובקיץ אני מעדיפה סנדלים נוחים יותר means and in summer I prefer more comfortable sandals

So the sentence sounds like a general seasonal preference or habit, not necessarily a description of what the person is wearing at this exact moment.

Hebrew present tense often covers both:

• a current action
• a habitual action
• a general preference

Context tells you which one is meant.