Slip-resistant buckle for safety swimming pool cover straps

Apparatus for, and in combination with, a swimming pool cover, comprising:

• a swimming pool cover configured to be installed and tensioned over said-a swimming pool;
• said cover having slot cutouts to pass around obstructions and maintain total coverage denying access to water below in said swimming pool, the swimming pool cover coupled to a surface surrounding said swimming pool;
• webbing straps extending from opposite side edges of said slot cutouts into said slot cutouts oppositely facing each other;
• a two piece buckle for joining said webbing straps in each slot cutout, the two piece buckle comprising;
• a male member in the form of a crescent half-moon shape, the male member coupled to one of said webbing straps in each slot cutout and
• a female member having a triangular shaped opening configured to receive said male member, the female member coupled to the oppositely facing webbing strap in each said slot cutout corresponding to a respective webbing strap including the male member;
• the joining of said male member and said female member requiring rotation of said male member by about 90 degrees to enter said triangular shaped opening of said female member;
• and
• whereby tensioning of said swimming pool cover places a pulling force on joined male and female members making it impossible for the two pieces of said buckle to be rotated and disengaged.