All-Star Cobalt Umpire Skull Cap

SC900UMP All-Star Cobalt Umpire Skull Cap Side View

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Includes FREE All-Star Umpire Mask or Skull Cap Mesh Bag ($12.99 value)



The Cobalt™ Skull Cap or "Skully" is the first hard shell skull cap made just for umpires and designed in collaboration with MLB & MiLB.

Aimed against bat backswings and to add an additional layer of force reduction, the helmet is like a coach's helmet but with enhanced shape, padding and features for baseball and softball umpires.

The shortened bill functions just like an umpire plate/combo (4-stitch) cap. It will fit under all brand or style umpire mask and not just All-Star masks.


  • Shortened bill fits with plenty of space in any umpire mask
  • Tough and durable polycarbonate shell
  • Textured sand matte finish to grip traditional harness (no harness upgrade needed)
  • Augmented padding in key zones along sides, rear, and top for added protection against bats
  • Removable padding system is machine washable
  • Fitted S to XL sizes to fit most head sizes. All-Star took head measurements of 50 MLB umpires to get the sizing right.


  • Interior: Remove the 3 pad which are Velcro'd in roof and headband of cap. Wash pads with warm water and mild soap. Rinse well and let hang dry in a well ventilated space
  • Clean the interior of the cap with a water/soap solution applied to a towel or use a disenfectant wipe
  • Exterior: See our Crew How-To on Buffing Scratches from your Cobalt Skull Cap

Product Video

Official Review: All-Star Cobalt Umpire Skull Cap

Ty takes you behind the plate with @AllStarSportsVids innovative skull cap designed specifically for baseball and softball umpires.

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Official Reviews


Brenda M.

Glenview, IL

August 12, 2022
Great airflow! Fits perfect and the material is very light. Yet protective! Good price.

Erich K.

Gaston, OR

July 8, 2022
I had a few worries about this, none of which were a problem. First, no one takes a second look when I'm wearing this. Second, it holds onto my head as good or better than a ball-cap. Third, It is light and not bulky at all. I tried the Unequal Uncap before this and was very unhappy with it. This helmet is absolutely perfect. You barely know it is there, and it is cooler temperature wise than a cap!

Joseph A.

St. Louis, MO

July 6, 2022
It takes a bit getting used to at first from a normal hat, but it’s amazing after you get used to it. I had to go to the hospital last year a couple times with concussions, but this year I haven’t gotten a concussion. I also feel much more protected with it on. You get the benefits of a full cage and just the mask. It’s like having the best of both worlds with this skull cap.

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Questions About This Product

Q: When I pull my mask over the top of the helmet the back strap of the Force 3 mask has a tendency to ride up the smooth surface of the skull cap & becomes a loose fit real fast. Several times I've had to keep it from coming off by holding with my hand. It's not safe nor effective to call pitches this way. Any suggestions or remedies to keep the mask secure on the slick surface on the back of the skull cap? Thank you.
– Peter Leonetti

We suggest installing a harness made from a more tacky material than the nylon straps of the Force3 Universal Umpire Mask Harness. The All-Star Delta Flex Umpire Mask Harness is the best solution. This harness was designed by All-Star with a tacky neoprene surface to grip their Cobalt Skull Cap. The UMPLIFE V2 Flex Umpire Harness is also a neoprene based harness in a traditional shape. Either of these harnesses will secure better to the skull cap surface.

– Hunter Fry
Buyer, Customer Service Specialist, Former Basketball Referee

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WARNING: Participants in any sports activity assume risk of injury. This equipment may be used to help aid in preventing or reducing the extent of injury. No equipment can guarantee umpire or player safety from injury during participation, and use of this equipment carries no such guarantee. Do not use any umpire equipment that is damaged in any way.