Taken from the US Lacrosse site at: http://www.uslacrosse.org/UtilityNav/AboutTheSport/Equipment.aspx
A protective helmet, equipped with face mask, chin pad and a cupped four point chin strap fastened to all four hookups, must be worn by all players. All helmets and face masks should be NOCSAE (National Operating Committee on Standards for Athletic Equipment) approved.
2nd thru 6th grades should get green helmets. 7th on up, it's optional to get the color of the future High School you will be attending.
The crosse (lacrosse stick) is made of wood, laminated wood or synthetic material, with a shaped net pocket at the end. The crosse must be an overall length of 40 - 42 inches for attackmen and midfielders, or 52 - 72 inches for defensemen. The head of the crosse must be 6.5 - 10 inches wide, except a goalie’s crosse which may be 10 - 12 inches wide. The pocket of a crosse shall be deemed illegal if the top surface of a lacrosse ball, when placed in the head of the crosse, is below the bottom edge of the side wall.
The mouthpiece must be a highly visible color and is mandatory.
All players are required to wear protective gloves. The cutting or altering of gloves is prohibited.
Other Protective Equipment:
All players, with the exception of the goalkeeper, must wear shoulder pads. Arm pads are required and rib pads are strongly recommended, and often required, as are athletic supporters and protective cups for all players.
The goalkeeper is required to wear a throat protector and chest protector, in addition to a helmet, mouthpiece, gloves and a protective cup.
The crosse (lacrosse stick) is made of wood, laminated wood, or synthetic material, with a shaped net pocket at the end. A girl's crosse must be an overall length of 35.5 - 43.25 inches. The head of the crosse must be seven to nine inches wide. The pocket of the stick must be strung traditionally; no mesh is allowed. The top of the ball when dropped in the pocket must remain above the side walls.* The goalkeeper¹s crosse may be 35.5- 48 inches long. The head of the crosse may be mesh and up to 12 inches wide.
All players must wear mouthguards that are not white or clear.
Close-fitting gloves, nose guards and soft head gear are optional and may be worn by all players. All field players must properly wear eye protection that meets ASTM specification standard F803 for women's adult/ youth lacrosse for the appropriate level of play.
The Goalkeeper's Equipment:
The goalkeeper must wear a helmet with face mask (NOCSAE approved), separate throat protector, padded gloves, mouth piece, and chest protector. The goalkeeper may wear padding on arms, legs, and shoulders which does not excessively increase the size of those body parts. High school level and below must wear padding on thighs and shins. Youth level must wear some form of abdominal and pelvic protection.
Goalies are required to wear padded gloves.