Abstract: The present invention relates to a sock (1), suitable for being worn in the performance of gymnastic activities, in gym or in aquatic environments. The sock (1) comprises a plantar surface (4) restable on walking surfaces, a first bay (2) containing the user's big toe and at least one second bay (3) containing the remaining toes of the user. The sock (1) further comprises anti-slipping means positioned on the plantar surface (4) for reducing the slipping risk of the user on the walking surfaces and comprising at least one anti-slipping island (5), which occupies a partial surface smaller than the total plantar surface (4).