Number + 双 + Noun
双 (shuāng) is a measure word meaning "pair," used to count items that naturally come in twos, such as shoes, hands, eyes, or chopsticks. It is placed between a number and the noun it quantifies. For example, 四双 means "four pairs."
我买了两双新鞋,一双运动鞋一双皮鞋。
wǒ mǎi le liǎng shuāng xīn xié, yī shuāng yùndòngxié yī shuāng píxié.
I bought two new pairs of shoes, one pair of sneakers and one pair of leather shoes.
这双筷子是竹子做的,用着很舒服。
zhè shuāng kuàizi shì zhúzi zuò de, yòng zhe hěn shūfu.
This pair of chopsticks is made of bamboo and is very comfortable to use.
她有一双很漂亮的大眼睛。
tā yǒu yī shuāng hěn piàoliang de dà yǎnjīng.
She has a pair of very beautiful big eyes.